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Pertanyaan

Diketahui distribusi peluang kumulatif suatu variabel acak diskrit berikut. a. Jika f(5) = 1/4, tentukan nilai k. b. Hitunglah nilai P ( 4 < X ≤ 6 )

Diketahui distribusi peluang kumulatif suatu variabel acak diskrit berikut.

a. Jika f(5) = 1/4, tentukan nilai k.

b. Hitunglah nilai

 

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Y. Fathoni

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta.

Jawaban terverifikasi

Jawaban

diperoleh nilai .

diperoleh nilai begin mathsize 14px style straight P open parentheses 4 less than straight X less or equal than 6 close parentheses equals 5 over 12 end style.

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Pembahasan

a. Menentukan nilai Berdasarkan tabel diketahui bahwa Karena diperoleh: Setelah diketahui bahwa , maka diperoleh Sehingga diperoleh nilai . b. Menghitung nilai Sehingga diperoleh nilai .

a. Menentukan nilai begin mathsize 14px style k end style

Berdasarkan tabel diketahui bahwa

begin mathsize 14px style straight F open parentheses 3 close parentheses equals straight P open parentheses straight X less or equal than 3 close parentheses straight P open parentheses straight X equals 3 close parentheses equals straight f open parentheses 3 close parentheses equals 1 fourth end style

Karena begin mathsize 14px style straight f open parentheses 3 close parentheses equals 1 fourth end style diperoleh:

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px 2px 2px end attributes row cell straight F open parentheses 4 close parentheses end cell equals cell straight P open parentheses straight X less or equal than 4 close parentheses end cell row cell k over 12 end cell equals cell straight P open parentheses straight X equals 3 close parentheses plus straight P open parentheses straight X equals 4 close parentheses end cell row cell k over 12 end cell equals cell f open parentheses 3 close parentheses plus f open parentheses 4 close parentheses end cell row cell k over 12 end cell equals cell 1 fourth plus f open parentheses 4 close parentheses end cell row cell k over 12 minus 1 fourth end cell equals cell f open parentheses 4 close parentheses end cell row cell fraction numerator k minus 3 over denominator 12 end fraction end cell equals cell f open parentheses 4 close parentheses end cell row cell f open parentheses 4 close parentheses end cell equals cell fraction numerator k minus 3 over denominator 12 end fraction end cell end table end style 

Setelah diketahui bahwa begin mathsize 14px style f open parentheses 3 close parentheses equals 1 fourth comma space f open parentheses 4 close parentheses equals fraction numerator k minus 3 over denominator 12 end fraction comma space dan space f open parentheses 5 close parentheses equals 1 fourth end style, maka diperoleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell F open parentheses 5 close parentheses end cell equals cell P open parentheses X less or equal than 5 close parentheses end cell row cell fraction numerator k minus 3 over denominator 3 end fraction end cell equals cell P open parentheses X equals 3 close parentheses plus P open parentheses X equals 4 close parentheses plus P open parentheses X equals 5 close parentheses end cell row cell fraction numerator k minus 3 over denominator 3 end fraction end cell equals cell f open parentheses 3 close parentheses plus f open parentheses 4 close parentheses plus f open parentheses 5 close parentheses end cell row cell fraction numerator k minus 3 over denominator 3 end fraction end cell equals cell 1 fourth plus fraction numerator k minus 3 over denominator 12 end fraction plus 1 fourth end cell row cell fraction numerator k minus 3 over denominator 3 end fraction minus fraction numerator k minus 3 over denominator 12 end fraction end cell equals cell 1 half end cell row cell fraction numerator 4 k minus 12 minus k plus 3 over denominator 12 end fraction end cell equals cell 1 half end cell row cell 3 k minus 9 end cell equals 6 row cell 3 k end cell equals 15 row k equals 5 end table end style 

Sehingga diperoleh nilai begin mathsize 14px style k equals 5 end style.

b. Menghitung nilai begin mathsize 14px style straight P left parenthesis 4 less than straight X less or equal than space 6 right parenthesis end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell P open parentheses 4 less than x less or equal than 6 close parentheses end cell equals cell P open parentheses X less or equal than 6 close parentheses minus P open parentheses X less or equal than 4 close parentheses end cell row blank equals cell k over 6 minus k over 12 end cell row blank equals cell fraction numerator 2 k minus k over denominator 12 end fraction end cell row blank equals cell k over 12 space space space open parentheses nilai space k equals 5 close parentheses end cell row blank equals cell 5 over 12 end cell end table end style 

Sehingga diperoleh nilai begin mathsize 14px style straight P open parentheses 4 less than straight X less or equal than 6 close parentheses equals 5 over 12 end style.

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