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Diketahui X berdistribusi binomial Tabel distribusi probabilitas dari variabel acak X adalah ....

Diketahui X berdistribusi binomial begin mathsize 12px style italic b open parentheses 4 comma 2 over 5 close parentheses end style Tabel distribusi probabilitas dari variabel acak X adalah ....

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A. Khairunisa

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Perhatikan bahwa sehingga Jika x = 0, maka Jika x = 1 maka Jika x = 2 maka Jika x = 3 maka Jika x = 4 maka Sehingga didapatkan tabel distribusi probabilitasnya adalah sebagai berikut

Perhatikan bahwa begin mathsize 12px style n equals 4 space dan space straight p equals 2 over 5 end style sehingga

begin mathsize 12px style P open parentheses X equals x close parentheses equals C presubscript n presuperscript subscript x times p to the power of x times open parentheses 1 minus p close parentheses to the power of n minus x end exponent P open parentheses X equals x close parentheses equals C presubscript 4 presuperscript subscript x times open parentheses 2 over 5 close parentheses to the power of x times open parentheses 1 minus 2 over 5 close parentheses to the power of 4 minus x end exponent P open parentheses X equals x close parentheses equals C presubscript 4 presuperscript subscript x times open parentheses 2 over 5 close parentheses to the power of x times open parentheses 3 over 5 close parentheses to the power of 4 minus x end exponent end style     

Jika x = 0, maka

Error converting from MathML to accessible text.     

Jika x = 1 maka

begin mathsize 12px style P open parentheses X equals 1 close parentheses equals C presubscript 4 presuperscript subscript 1 times open parentheses 2 over 5 close parentheses to the power of 1 times open parentheses 3 over 5 close parentheses to the power of 4 minus 1 end exponent equals fraction numerator 4 factorial over denominator open parentheses 4 minus 1 close parentheses factorial 1 factorial end fraction times 2 over 5 times open parentheses 3 over 5 close parentheses cubed equals fraction numerator 4 times 3 factorial over denominator 3 factorial times 1 end fraction times 2 over 5 times 27 over 125 equals 4 times 2 over 5 times 27 over 125 equals 216 over 625 end style           

Jika x = 2 maka

begin mathsize 12px style P open parentheses X equals 2 close parentheses equals C presubscript 4 presuperscript subscript 2 times open parentheses 2 over 5 close parentheses squared times open parentheses 3 over 5 close parentheses to the power of 4 minus 2 end exponent equals fraction numerator 4 factorial over denominator open parentheses 4 minus 2 close parentheses factorial 2 factorial end fraction times open parentheses 2 over 5 close parentheses squared times open parentheses 3 over 5 close parentheses squared equals fraction numerator 4 times 3 times 2 factorial over denominator 2 factorial times 2 times 1 end fraction times 4 over 25 times 9 over 25 equals 6 times 4 over 25 times 9 over 25 equals 216 over 625 end style     

Jika x = 3 maka

begin mathsize 12px style P open parentheses X equals 3 close parentheses equals C presubscript 4 presuperscript subscript 3 times open parentheses 2 over 5 close parentheses cubed times open parentheses 3 over 5 close parentheses to the power of 4 minus 3 end exponent equals fraction numerator 4 factorial over denominator open parentheses 4 minus 3 close parentheses factorial 3 factorial end fraction times open parentheses 2 over 5 close parentheses cubed times open parentheses 3 over 5 close parentheses to the power of 1 equals fraction numerator 4 times 3 factorial over denominator 1 factorial times 3 factorial end fraction times 8 over 125 times 3 over 5 equals 4 times 8 over 125 times 3 over 5 equals 96 over 625 end style     

Jika x  = 4 maka

begin mathsize 12px style P open parentheses X equals 4 close parentheses equals C presubscript 4 presuperscript subscript 4 times open parentheses 2 over 5 close parentheses to the power of 4 times open parentheses 3 over 5 close parentheses to the power of 4 minus 4 end exponent equals fraction numerator 4 factorial over denominator open parentheses 4 minus 4 close parentheses factorial 4 factorial end fraction times open parentheses 2 over 5 close parentheses to the power of 4 times open parentheses 3 over 5 close parentheses to the power of 0 equals fraction numerator 4 factorial over denominator 0 factorial times 4 factorial end fraction times 16 over 625 times 1 equals 1 times 16 over 625 times 1 equals 16 over 625 end style        

Sehingga didapatkan tabel distribusi probabilitasnya adalah sebagai berikut

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