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Nilai dari adalah ....

Nilai dari begin mathsize 14px style integral subscript 249 superscript 251 , 2 end superscript fraction numerator 1 over denominator 5 square root of 2 pi end root end fraction e to the power of negative 1 half open parentheses fraction numerator x minus 250 over denominator 5 end fraction close parentheses squared end exponent d x end style adalah ....

  1. 0,0156

  2. 0,0174

  3. 0,087

  4. 0,1558

  5. 0,1741

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A. Khairunisa

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Perhatikan fungsi berikut Fungsi tersebut adalah fungsi kepadatan dari variabel acak X yang berdistribusi Normal dengan μ = 250 dan σ = 5. Sehingga Maka X berdistribusi N(250, 25). Perhatikan bahwa Misalkan Sehingga Z berdistribusi N(0, 1). Maka didapat Perhatikan potongan tabel distribusi Normal standar berikut Karena Z~N(0, 1), maka berdasarkan tabel di atas didapat bahwa P(0 < Z < 0,2) = 0,0793 P(0 < Z < 0,24) = 0,0948 Sehingga

Perhatikan fungsi berikut

begin mathsize 14px style f open parentheses x close parentheses equals fraction numerator 1 over denominator 5 square root of 2 pi end root end fraction e to the power of negative 1 half open parentheses fraction numerator x minus 250 over denominator 5 end fraction close parentheses squared end exponent end style 

Fungsi tersebut adalah fungsi kepadatan dari variabel acak X yang berdistribusi Normal dengan μ = 250 dan σ = 5. Sehingga begin mathsize 14px style sigma squared equals 25 end style

Maka X berdistribusi N(250, 25).

 

Perhatikan bahwa

begin mathsize 14px style integral subscript 249 superscript 251 , 2 end superscript fraction numerator 1 over denominator 5 square root of 2 pi end root end fraction e to the power of negative 1 half open parentheses fraction numerator x minus 250 over denominator 5 end fraction close parentheses squared end exponent d x equals integral subscript 249 superscript 251 , 2 end superscript f open parentheses x close parentheses d x space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals P open parentheses 249 less than X less than 251 , 2 close parentheses space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals P open parentheses fraction numerator 249 minus mu over denominator sigma end fraction less than fraction numerator X minus mu over denominator sigma end fraction less than fraction numerator 251 , 2 minus mu over denominator sigma end fraction close parentheses end style 

Misalkan Error converting from MathML to accessible text. Sehingga Z berdistribusi N(0, 1).

 

Maka didapat

begin mathsize 14px style integral subscript 249 superscript 251 , 2 end superscript fraction numerator 1 over denominator 5 square root of 2 pi end root end fraction e to the power of negative 1 half open parentheses fraction numerator x minus 250 over denominator 5 end fraction close parentheses squared end exponent d x equals P open parentheses fraction numerator 249 minus mu over denominator sigma end fraction less than fraction numerator X minus mu over denominator sigma end fraction less than fraction numerator 251 , 2 minus mu over denominator sigma end fraction close parentheses equals P open parentheses fraction numerator 249 minus 250 over denominator 5 end fraction less than Z less than fraction numerator 251 , 2 minus 250 over denominator 5 end fraction close parentheses equals P open parentheses fraction numerator negative 1 over denominator 5 end fraction less than Z less than fraction numerator 1 , 2 over denominator 5 end fraction close parentheses equals P open parentheses negative 0 , 2 less than Z less than 0 , 24 close parentheses equals P open parentheses negative 0 , 2 less than Z less than 0 close parentheses plus P open parentheses 0 less than Z less than 0 , 24 close parentheses equals P open parentheses 0 less than Z less than 0 , 2 close parentheses plus P open parentheses 0 less than Z less than 0 , 24 close parentheses end style  

 

Perhatikan potongan tabel distribusi Normal standar berikut

Karena Z~N(0, 1), maka berdasarkan tabel di atas didapat bahwa

P(0 < Z < 0,2) = 0,0793

P(0 < Z < 0,24) = 0,0948

Sehingga

begin mathsize 14px style integral subscript 249 superscript 251 , 2 end superscript fraction numerator 1 over denominator 5 square root of 2 pi end root end fraction e to the power of negative 1 half open parentheses fraction numerator x minus 250 over denominator 5 end fraction close parentheses squared end exponent d x equals P open parentheses 0 less than Z less than 0 , 2 close parentheses plus P open parentheses 0 less than Z less than 0 , 24 close parentheses equals 0 , 0793 plus 0 , 0948 equals 0 , 1741 end style 

 

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