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Pertanyaan

Diketahui X adalah suatu variabel acak dengan tabel distribusi probabilitas sebagai berikut : Variansi dari X adalah ....

Diketahui adalah suatu variabel acak dengan tabel distribusi probabilitas sebagai berikut :

Variansi dari X adalah ....

  1. 0,2

  2. 10,5

  3. 35,25

  4. 110,25

  5. 145,5

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A. Khairunisa

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Perhatikan bahwa Sehingga dan Maka variansi dari X dinyatakan sebagai

Perhatikan bahwa

begin mathsize 12px style sum with italic i equals 1 below and italic n on top P open parentheses italic X equals italic x subscript italic i close parentheses equals 1 P open parentheses italic X equals 0 close parentheses plus P open parentheses italic X equals 1 close parentheses plus P open parentheses italic X equals 2 close parentheses plus P open parentheses italic X equals 3 close parentheses plus P open parentheses italic X equals 4 close parentheses equals 1 open parentheses italic t minus sign italic t squared close parentheses plus open parentheses italic t minus sign 0 , 1 close parentheses plus open parentheses 0 , 5 minus sign italic t close parentheses plus open parentheses 2 italic t minus sign italic t squared close parentheses plus 2 italic t squared equals 1 3 italic t plus 0 , 4 equals 1 3 italic t equals 0 , 6 italic t equals 0 , 2 end style      

Sehingga

begin mathsize 12px style italic mu equals italic E open parentheses italic X close parentheses equals italic sum with italic i italic equals italic 1 below and italic n on top begin italic style left parenthesis italic x straight ⋅ P open parentheses italic X straight equals italic x subscript italic i close parentheses right parenthesis end style equals 0 bullet open parentheses italic t minus sign italic t squared close parentheses plus 5 bullet open parentheses italic t minus sign 0 , 1 close parentheses plus 10 bullet open parentheses 0 , 5 minus sign italic t close parentheses plus 15 bullet open parentheses 2 italic t minus sign italic t squared close parentheses plus 20 bullet 2 italic t squared equals 0 plus 5 italic t minus sign 0 , 5 plus 5 minus sign 10 italic t plus 30 italic t minus sign 15 italic t to the power of italic 2 plus 40 italic t to the power of italic 2 equals 25 italic t to the power of italic 2 plus 25 italic t plus 4 , 5 equals 25 open parentheses 0 , 2 close parentheses squared plus 25 open parentheses 0 , 2 close parentheses plus 4 , 5 equals 25 open parentheses 0 , 04 close parentheses plus 25 open parentheses 0 , 2 close parentheses plus 4 , 5 equals 1 plus 5 plus 4 , 5 equals 10 , 5 end style      

dan

begin mathsize 12px style italic E open parentheses italic X squared close parentheses equals sum with italic i equals 1 below and italic n on top open parentheses italic x squared ⋅ P open parentheses italic X equals italic x subscript italic i close parentheses close parentheses equals 0 squared bullet open parentheses italic t minus sign italic t squared close parentheses plus 5 squared bullet open parentheses italic t minus sign 0 , 1 close parentheses plus 10 squared bullet open parentheses 0 , 5 minus sign italic t close parentheses plus 15 squared bullet open parentheses 2 italic t minus sign italic t squared close parentheses plus 20 squared bullet 2 italic t squared equals 0 bullet begin italic style left parenthesis italic t straight minus sign italic t to the power of straight 2 right parenthesis end style plus 25 bullet begin italic style left parenthesis italic t straight minus sign straight 0 , 1 right parenthesis end style plus 100 bullet begin italic style left parenthesis straight 0 , 5 straight minus sign italic t right parenthesis end style plus 225 bullet begin italic style left parenthesis straight 2 italic t straight minus sign italic t to the power of straight 2 right parenthesis end style plus 400 bullet 2 italic t to the power of italic 2 equals 0 plus 25 italic t minus sign 2 , 5 plus 50 minus sign 100 italic t plus 450 italic t minus sign 225 italic t to the power of italic 2 plus 800 italic t to the power of italic 2 equals 575 italic t to the power of italic 2 plus 375 italic t plus 47 , 5 equals 575 open parentheses 0 , 2 close parentheses squared plus 375 open parentheses 0 , 2 close parentheses plus 47 , 5 equals 575 open parentheses 0 , 04 close parentheses plus 375 open parentheses 0 , 2 close parentheses plus 47 , 5 equals 23 plus 75 plus 47 , 5 equals 145 , 5 end style     

Maka variansi dari dinyatakan sebagai

begin mathsize 12px style V italic a italic r open parentheses italic X close parentheses equals italic sigma squared equals italic E begin italic style left parenthesis italic X to the power of straight 2 right parenthesis end style minus sign italic mu to the power of italic 2 equals 145 , 5 minus sign begin italic style left parenthesis straight 10 , 5 right parenthesis end style to the power of italic 2 equals 145 , 5 minus sign 110 , 25 equals 35 , 25 end style   

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