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Pertanyaan

Didefinisikan fungsi kepadatan dari variabel acak X sebagai berikut maka ....

Didefinisikan fungsi kepadatan dari variabel acak X sebagai berikut

begin mathsize 14px style f open parentheses x close parentheses equals open curly brackets table attributes columnalign right end attributes row cell 1 over 16 x comma end cell cell 1 less or equal than x less than 3 end cell row cell 1 half comma end cell cell 3 less or equal than x less than 4 end cell row cell 1 fourth comma end cell cell 4 less or equal than x less or equal than 5 end cell end table close end style

maka undefined....

  1. begin mathsize 14px style 25 over 2 end style 

  2. size 14px 41 over size 14px 12 

  3. size 14px 283 over size 14px 24 

  4. size 14px 739 over size 14px 16 

  5. fraction numerator size 14px 3.837 over denominator size 14px 80 end fraction 

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A. Khairunisa

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

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Pembahasan

Dapat diperhatikan bahwa X adalah variabel acak kontinu yang nilainya berada di antara 1 dan 5, maka

Dapat diperhatikan bahwa X adalah variabel acak kontinu yang nilainya berada di antara 1 dan 5, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E open parentheses X cubed close parentheses end cell equals cell integral subscript 1 superscript 5 x cubed times f open parentheses x close parentheses d x end cell row blank equals cell integral subscript 1 superscript 3 x cubed times 1 over 16 x d x plus integral subscript 3 superscript 4 x cubed times 1 half d x plus integral subscript 4 superscript 5 x cubed times 1 fourth d x end cell row blank equals cell integral subscript 1 superscript 3 1 over 16 x to the power of 4 d x plus integral subscript 3 superscript 4 1 half x cubed d x plus integral subscript 4 superscript 5 1 fourth x cubed d x end cell row blank equals cell open 1 over 80 x to the power of 5 close square brackets subscript 1 superscript 3 plus open 1 over 8 x to the power of 4 close square brackets subscript 3 superscript 4 plus open 1 over 16 x to the power of 4 close square brackets subscript 4 superscript 5 end cell row blank equals cell open parentheses 1 over 80 open parentheses 3 to the power of 5 close parentheses minus 1 over 80 open parentheses 1 to the power of 5 close parentheses close parentheses plus open parentheses 1 over 8 open parentheses 4 to the power of 4 close parentheses minus 1 over 8 open parentheses 3 to the power of 4 close parentheses close parentheses plus open parentheses 1 over 16 open parentheses 5 to the power of 4 close parentheses minus 1 over 16 open parentheses 4 to the power of 4 close parentheses close parentheses end cell row blank equals cell 1 over 80 open parentheses 3 to the power of 5 minus 1 to the power of 5 close parentheses plus 1 over 8 open parentheses 4 to the power of 4 minus 3 to the power of 4 close parentheses plus 1 over 16 left parenthesis 5 to the power of 4 minus 4 to the power of 4 right parenthesis end cell row blank equals cell 1 over 80 open parentheses 243 minus 1 close parentheses plus 1 over 8 open parentheses 256 minus 81 close parentheses plus 1 over 16 left parenthesis 625 minus 256 right parenthesis end cell row blank equals cell 242 over 80 plus 175 over 8 plus 369 over 16 end cell row blank equals cell 242 over 80 plus fraction numerator 1.750 over denominator 80 end fraction plus fraction numerator 1.845 over denominator 80 end fraction end cell row blank equals cell fraction numerator 3.837 over denominator 80 end fraction end cell end table end style 

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Diketahui X adalah variabel acak kontinu yang nilainya berada di antara 1 dan 4. Jika fungsi kepadatan dari X adalah , maka ....

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