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Pertanyaan

Diketahui X berdistribusi binomial b ( n , p ) . Jika μ = 5 1 ​ n ,maka =....

Diketahui X berdistribusi binomial . Jika , maka begin mathsize 14px style E open parentheses X squared close parentheses end style = ....

  1. begin mathsize 14px style fraction numerator n squared plus 4 n over denominator 25 end fraction end style 

  2. begin mathsize 14px style fraction numerator n squared plus n over denominator 25 end fraction end style 

  3. begin mathsize 14px style n squared over 25 end style 

  4. begin mathsize 14px style fraction numerator n squared minus n over denominator 25 end fraction end style 

  5. begin mathsize 14px style fraction numerator n squared minus 4 n over denominator 25 end fraction end style 

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S. Dwi

Master Teacher

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Pembahasan

Perhatikan bahwa pada distribusi binomial, berlaku Karena ,maka Sehingga Ingat bahwa Maka, jawaban yang tepat adalah A.

Perhatikan bahwa pada distribusi binomial, berlaku

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row mu equals cell n p end cell row cell sigma squared end cell equals cell n p open parentheses 1 minus p close parentheses end cell end table end style

Karena begin mathsize 14px style mu equals 1 third n end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row mu equals cell n p end cell row cell 1 fifth n end cell equals cell n p end cell row p equals cell 1 fifth end cell end table end style

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V a r open parentheses X close parentheses end cell equals cell sigma squared end cell row blank equals cell n p open parentheses 1 minus p close parentheses end cell row blank equals cell n open parentheses 1 fifth close parentheses open parentheses 1 minus 1 fifth close parentheses end cell row blank equals cell n open parentheses 1 fifth close parentheses open parentheses 4 over 5 close parentheses end cell row blank equals cell fraction numerator 4 n over denominator 25 end fraction end cell end table end style

Ingat bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V a r open parentheses X close parentheses end cell equals cell E open parentheses X squared close parentheses minus mu squared end cell row cell fraction numerator 4 n over denominator 25 end fraction end cell equals cell E open parentheses X squared close parentheses minus open parentheses 1 fifth n close parentheses squared end cell row cell fraction numerator 4 n over denominator 25 end fraction end cell equals cell E open parentheses X squared close parentheses minus n squared over 25 end cell row cell E open parentheses X squared close parentheses end cell equals cell n squared over 25 plus fraction numerator 4 n over denominator 25 end fraction end cell row cell E open parentheses X squared close parentheses end cell equals cell fraction numerator n squared plus 4 n over denominator 25 end fraction end cell end table end style

Maka, jawaban yang tepat adalah A.

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