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Sebuah tes remidi diikuti 10 siswa. Peluang setiap siswa lulus remidi adalah sama yaitu 0 , 7 . Peluang tidak kurang dari 5 siswa lulus remidi adalah ...

Sebuah tes remidi diikuti  siswa. Peluang setiap siswa lulus remidi adalah sama yaitu . Peluang tidak kurang dari  siswa lulus remidi adalah ...

  1. begin mathsize 14px style 0 comma 0368 end style

  2. begin mathsize 14px style 0 comma 0473 end style

  3. begin mathsize 14px style 0 comma 1503 end style

  4. size 14px 0 size 14px comma size 14px 8497

  5. begin mathsize 14px style 0 comma 9527 end style

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L. Marlina

Master Teacher

Mahasiswa/Alumni Institut Teknologi Bandung

Jawaban terverifikasi

Pembahasan

Perhatikan perhitungan berikut ini. Ingat, distribusi Binomial: Diketahui sebuah tes remidi diikuti siswa. Peluang setiap siswa lulus remidi adalah sama yaitu . Peluang tidak kurang dari siswa lulus remidi yaitu: Peluang siswa lulus remidi: Peluang siswa tidak lulus remidi: Maka: dengan sehingga Jadi, peluang tidak kurang dari siswa lulus remidiadalah atau dibulatkan menjadi . Oleh karena itu, jawaban yang tepat adalah E.

Perhatikan perhitungan berikut ini.

Ingat, distribusi Binomial:

begin mathsize 14px style straight P open parentheses straight X close parentheses equals straight C subscript straight x superscript straight n times p to the power of straight x times q to the power of straight n minus straight x end exponent end style

Diketahui sebuah tes remidi diikuti begin mathsize 14px style 10 end style siswa. Peluang setiap siswa lulus remidi adalah sama yaitu begin mathsize 14px style 0 comma 7 end style. Peluang tidak kurang dari begin mathsize 14px style 5 end style siswa lulus remidi yaitu:

Peluang siswa lulus remidi:

begin mathsize 14px style p equals 0 comma 7 end style

Peluang siswa tidak lulus remidi:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row q equals cell 1 minus p end cell row blank equals cell 1 minus 0 comma 7 end cell row blank equals cell 0 comma 3 end cell end table end style

Maka:

begin mathsize 14px style straight P open parentheses straight X greater or equal than 5 close parentheses equals straight P open parentheses 5 close parentheses plus straight P open parentheses 6 close parentheses plus straight P open parentheses 7 close parentheses plus straight P open parentheses 8 close parentheses plus straight P open parentheses 9 close parentheses plus straight P open parentheses 10 close parentheses end style

dengan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P open parentheses 5 close parentheses end cell equals cell straight C subscript 5 superscript 10 times p to the power of 5 times q to the power of 10 minus 5 end exponent end cell row blank equals cell straight C subscript 5 superscript 10 times p to the power of 5 times q to the power of 5 end cell row blank equals cell fraction numerator 10 factorial over denominator 5 factorial times 5 factorial end fraction times open parentheses 0 comma 7 close parentheses to the power of 5 times open parentheses 0 comma 3 close parentheses to the power of 5 end cell row blank equals cell fraction numerator 10 times 9 times 8 times 7 times 6 times 5 factorial over denominator 5 factorial times 5 times 4 times 3 times 2 times 1 end fraction times open parentheses 0 comma 7 close parentheses to the power of 5 times open parentheses 0 comma 3 close parentheses to the power of 5 end cell row blank equals cell fraction numerator 10 times 9 times 8 times 7 times 6 over denominator 5 times 4 times 3 times 2 times 1 end fraction times open parentheses 0 comma 7 close parentheses to the power of 5 times open parentheses 0 comma 3 close parentheses to the power of 5 end cell row blank equals cell 252 times open parentheses 0 comma 16807 close parentheses times open parentheses 0 comma 00243 close parentheses end cell row blank equals cell 0 comma 1029193452 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis 6 right parenthesis end cell equals cell straight C subscript 6 superscript 10 times p to the power of 6 times q to the power of 10 minus 6 end exponent end cell row blank equals cell straight C subscript 6 superscript 10 times p to the power of 6 times q to the power of 4 end cell row blank equals cell fraction numerator 10 factorial over denominator 6 factorial times 4 factorial end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 6 times left parenthesis 0 comma 3 right parenthesis to the power of 4 space end cell row blank equals cell fraction numerator 10 times 9 times 8 times 7 times 6 factorial over denominator 6 factorial times 4 times 3 times 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 6 times left parenthesis 0 comma 3 right parenthesis to the power of 4 space end cell row blank equals cell fraction numerator 10 times 9 times 8 times 7 over denominator 4 times 3 times 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 6 times left parenthesis 0 comma 3 right parenthesis to the power of 4 space end cell row blank equals cell 210 times left parenthesis 0 comma 117649 right parenthesis times left parenthesis 0 comma 0081 right parenthesis end cell row blank equals cell 0 comma 200120949 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis 7 right parenthesis end cell equals cell straight C subscript 7 superscript 10 times p to the power of 7 times q to the power of 10 minus 7 end exponent end cell row blank equals cell straight C subscript 7 superscript 10 times p to the power of 7 times q cubed end cell row blank equals cell fraction numerator 10 factorial over denominator 7 factorial times 3 factorial end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 7 times left parenthesis 0 comma 3 right parenthesis cubed space end cell row blank equals cell fraction numerator 10 times 9 times 8 times 7 factorial over denominator 7 factorial times 3 times 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 7 times left parenthesis 0 comma 3 right parenthesis cubed space end cell row blank equals cell fraction numerator 10 times 9 times 8 over denominator 3 times 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 7 times left parenthesis 0 comma 3 right parenthesis cubed space end cell row blank equals cell 120 times left parenthesis 0 comma 0823543 right parenthesis times left parenthesis 0 comma 027 right parenthesis end cell row blank equals cell 0 comma 266827932 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis 8 right parenthesis end cell equals cell straight C subscript 8 superscript 10 times p to the power of 8 times q to the power of 10 minus 8 end exponent end cell row blank equals cell straight C subscript 8 superscript 10 times p to the power of 8 times q squared end cell row blank equals cell fraction numerator 10 factorial over denominator 8 factorial times 2 factorial end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 8 times left parenthesis 0 comma 3 right parenthesis squared space end cell row blank equals cell fraction numerator 10 times 9 times 8 factorial over denominator 8 factorial times 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 8 times left parenthesis 0 comma 3 right parenthesis squared space end cell row blank equals cell fraction numerator 10 times 9 over denominator 2 times 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 8 times left parenthesis 0 comma 3 right parenthesis squared space end cell row blank equals cell 45 times left parenthesis 0 comma 05764801 right parenthesis times left parenthesis 0 comma 09 right parenthesis end cell row blank equals cell 0 comma 2334744405 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis 9 right parenthesis end cell equals cell straight C subscript 9 superscript 10 times p to the power of 9 times q to the power of 10 minus 9 end exponent end cell row blank equals cell straight C subscript 9 superscript 10 times p to the power of 9 times q to the power of 1 end cell row blank equals cell fraction numerator 10 factorial over denominator 9 factorial times 1 factorial end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 9 times left parenthesis 0 comma 3 right parenthesis to the power of 1 space end cell row blank equals cell fraction numerator 10 times 9 factorial over denominator 9 factorial 1 end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 9 times left parenthesis 0 comma 3 right parenthesis to the power of 1 space end cell row blank equals cell 10 over 1 times left parenthesis 0 comma 7 right parenthesis to the power of 9 times left parenthesis 0 comma 3 right parenthesis to the power of 1 space end cell row blank equals cell 10 times left parenthesis 0 comma 040353607 right parenthesis times left parenthesis 0 comma 3 right parenthesis end cell row blank equals cell 0 comma 121060821 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis 10 right parenthesis end cell equals cell straight C subscript 10 superscript 10 times p to the power of 10 times q to the power of 10 minus 10 end exponent end cell row blank equals cell straight C subscript 10 superscript 10 times p to the power of 10 times q to the power of 0 end cell row blank equals cell fraction numerator 10 factorial over denominator 10 factorial times 0 factorial end fraction times left parenthesis 0 comma 7 right parenthesis to the power of 10 times left parenthesis 0 comma 3 right parenthesis to the power of 0 space end cell row blank equals cell 1 over 1 times left parenthesis 0 comma 7 right parenthesis to the power of 10 times 1 space end cell row blank equals cell 0 comma 0282475249 end cell end table end style

sehingga

begin mathsize 12px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight P left parenthesis straight X end cell greater or equal than cell 5 right parenthesis equals straight P left parenthesis 5 right parenthesis plus straight P left parenthesis 6 right parenthesis plus straight P left parenthesis 7 right parenthesis plus straight P left parenthesis 8 right parenthesis plus straight P left parenthesis 9 right parenthesis plus straight P left parenthesis 10 right parenthesis end cell row blank equals cell open parentheses table row cell 0 comma 1029193452 plus 0 comma 200120949 plus 0 comma 266827932 plus end cell row cell 0 comma 2334744405 plus 0 comma 121060821 plus 0 comma 0282475249 end cell end table close parentheses end cell row blank equals cell 0 comma 9526510126 end cell end table end style

Jadi, peluang tidak kurang dari begin mathsize 14px style 5 end style siswa lulus remidi adalah begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 9526510126 end table end style atau dibulatkan menjadi begin mathsize 14px style 0 comma 9527 end style.

Oleh karena itu, jawaban yang tepat adalah E.

 

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