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Diketahui suatu variabel acak X dengan X ∼ b ( 5 , 0.7 ) . Nilai dari P ( 2 ≤ X ≤ 5 ) adalah ....

Diketahui suatu variabel acak X dengan . Nilai dari  adalah ....

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M. Mariyam

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

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Jawaban

pilihan jawaban yang tepat adalah E.

pilihan jawaban yang tepat adalah E.

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Pembahasan

Perhatikan bahwa variabel acak X berdistribusi binomial dengan n = 5 dan p = 0,7. Sehingga didapat Maka Kemudian perhatikan bahwa dengan dan Sehingga Jadi, pilihan jawaban yang tepat adalah E.

Perhatikan bahwa variabel acak X berdistribusi binomial dengan n = 5 dan p = 0,7. Sehingga didapat

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 , 7 end cell row blank equals cell 0 , 3 end cell end table end style

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P open parentheses X equals x close parentheses end cell equals cell C presubscript n presuperscript blank subscript x times p to the power of x times q to the power of n minus x end exponent end cell row blank equals cell C presubscript 5 presuperscript blank subscript x times open parentheses 0 , 7 close parentheses to the power of x times open parentheses 0 , 3 close parentheses to the power of 5 minus x end exponent end cell row blank equals cell C presubscript 5 presuperscript blank subscript x times open parentheses 7 over 10 close parentheses to the power of x times open parentheses 3 over 10 close parentheses to the power of 5 minus x end exponent end cell end table end style

Kemudian perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P open parentheses 0 less or equal than X less or equal than 5 close parentheses end cell equals 1 row cell P open parentheses 0 less or equal than X less or equal than 1 close parentheses plus P open parentheses 2 less or equal than X less or equal than 5 close parentheses end cell equals 1 row cell P open parentheses 2 less or equal than X less or equal than 5 close parentheses end cell equals cell 1 minus P open parentheses 0 less or equal than X less or equal than 1 close parentheses end cell row cell P open parentheses 2 less or equal than X less or equal than 5 close parentheses end cell equals cell 1 minus open parentheses P open parentheses X equals 0 close parentheses plus P open parentheses X equals 1 close parentheses close parentheses end cell end table end style

dengan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P open parentheses X equals 0 close parentheses end cell equals cell C presubscript 5 presuperscript blank subscript 0 times open parentheses 7 over 10 close parentheses to the power of 0 times open parentheses 3 over 10 close parentheses to the power of 5 minus 0 end exponent end cell row blank equals cell fraction numerator 5 factorial over denominator open parentheses 5 minus 0 close parentheses factorial times 0 factorial end fraction times open parentheses 7 over 10 close parentheses to the power of 0 times open parentheses 3 over 10 close parentheses to the power of 5 end cell row blank equals cell fraction numerator 5 factorial over denominator 5 factorial times 1 end fraction times 1 times fraction numerator 243 over denominator 100.000 end fraction end cell row blank equals cell 1 over 1 times 1 times fraction numerator 243 over denominator 100.000 end fraction end cell row blank equals cell fraction numerator 243 over denominator 100.000 end fraction end cell row blank equals cell 0 , 00243 end cell end table end style

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P open parentheses X equals 1 close parentheses end cell equals cell C presubscript 5 presuperscript blank subscript 1 times open parentheses 7 over 10 close parentheses to the power of 1 times open parentheses 3 over 10 close parentheses to the power of 5 minus 1 end exponent end cell row blank equals cell fraction numerator 5 factorial over denominator open parentheses 5 minus 1 close parentheses factorial times 1 factorial end fraction times open parentheses 7 over 10 close parentheses to the power of 1 times open parentheses 3 over 10 close parentheses to the power of 4 end cell row blank equals cell fraction numerator 5 times 4 factorial over denominator 4 factorial times 1 end fraction times 7 over 10 times fraction numerator 81 over denominator 10.000 end fraction end cell row blank equals cell 5 over 1 times 7 over 10 times fraction numerator 81 over denominator 10.000 end fraction end cell row blank equals cell fraction numerator 2.835 over denominator 100.000 end fraction end cell row blank equals cell 0 , 02835 end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P open parentheses 2 less or equal than X less or equal than 5 close parentheses end cell equals cell 1 minus open parentheses P open parentheses X equals 0 close parentheses plus P open parentheses X equals 1 close parentheses close parentheses end cell row blank equals cell 1 minus open parentheses 0 , 00243 plus 0 , 02835 close parentheses end cell row blank equals cell 1 minus 0 , 03078 end cell row blank equals cell 0 , 96922 end cell end table end style 

Jadi, pilihan jawaban yang tepat adalah E.

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