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Perhatikan tabel P(0 < Z < z) berikut untuk menjawab soal di bawah ini. Diketahui X ∼ N ( μ , σ ) . Jika P ( X ≥ 53 ) = 0 , 0594 dan P ( X ≤ 40 ) = 0 , 8508 , maka P ( μ ≤ X ≤ σ ) = ...

Perhatikan tabel P(0 < Z < z) berikut untuk menjawab soal di bawah ini.

Diketahui  . Jika  dan  , maka  = ...

  1. 0,1103

  2. 0,1700

  3. 0,2088

  4. 0,4970

  5. 0,4192

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Pembahasan

Perhatikan bahwa Berdasarkan tabel didapat Perhatikan pula bahwa Berdasarkan tabel didapat Maka Sehingga

Perhatikan bahwa

begin mathsize 12px style P open parentheses X greater or equal than 53 close parentheses equals 0 comma 0594 P open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 0594 1 minus P open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 0594 open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 9406 P open parentheses Z less than 0 close parentheses plus P open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 9406 0 comma 5 plus P open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 9406 P open parentheses Z greater or equal than fraction numerator 53 minus mu over denominator sigma end fraction close parentheses equals 0 comma 4406 end style  

 

Berdasarkan tabel didapat

begin mathsize 12px style fraction numerator 53 minus mu over denominator sigma end fraction equals 1 comma 56 53 minus mu equals 1 comma 56 sigma mu equals 53 minus 1 comma 56 sigma end style  

 

Perhatikan pula bahwa

begin mathsize 12px style P open parentheses X less or equal than 40 close parentheses equals 0 comma 8508 P open parentheses Z less or equal than fraction numerator 40 minus mu over denominator sigma end fraction close parentheses equals 0 comma 8508 P open parentheses Z less than 0 close parentheses plus P open parentheses 0 less than Z less or equal than fraction numerator 40 minus mu over denominator sigma end fraction close parentheses equals 0 comma 8508 0 comma 5 plus P open parentheses 0 less than Z less or equal than fraction numerator 40 minus mu over denominator sigma end fraction close parentheses equals 0 comma 8508 P open parentheses 0 less than Z less or equal than fraction numerator 40 minus mu over denominator sigma end fraction close parentheses equals 0 comma 4508 end style   

 

Berdasarkan tabel didapat

fraction numerator size 12px 40 size 12px minus size 12px mu over denominator size 12px sigma end fraction size 12px equals size 12px 1 size 12px comma size 12px 04 size 12px 40 size 12px minus size 12px mu size 12px equals size 12px 1 size 12px comma size 12px 04 size 12px sigma size 12px 40 size 12px minus size 12px left parenthesis size 12px 53 size 12px minus size 12px 1 size 12px comma size 12px 56 size 12px sigma size 12px right parenthesis size 12px equals size 12px 1 size 12px comma size 12px 04 size 12px sigma size 12px minus size 12px 13 size 12px plus size 12px 1 size 12px comma size 12px 56 size 12px sigma size 12px equals size 12px 1 size 12px comma size 12px 04 size 12px sigma size 12px 0 size 12px comma size 12px 52 size 12px sigma size 12px equals size 12px 13 size 12px sigma size 12px equals size 12px 25  

 

Maka

begin mathsize 12px style mu equals 53 minus 1 comma 56 sigma mu equals 53 minus 1 comma 56 open parentheses 25 close parentheses mu equals 53 minus 39 mu equals 14 end style  

 

Sehingga

begin mathsize 12px style P open parentheses mu less or equal than X less or equal than sigma close parentheses equals P open parentheses fraction numerator mu minus mu over denominator sigma end fraction less or equal than Z less or equal than fraction numerator sigma minus mu over denominator sigma end fraction close parentheses equals P open parentheses 0 less or equal than Z less or equal than fraction numerator 25 minus 14 over denominator 25 end fraction close parentheses equals P open parentheses 0 less or equal than Z less or equal than 0 comma 44 close parentheses equals 0 comma 1700 end style  

 

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