हिंदी

Marks of 5 students of a group are 8, 12, 13, 15 and 22, then find the variance.

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प्रश्न

Marks of 5 students of a group are 8, 12, 13, 15 and 22, then find the variance.

विकल्प

  • 22.1

  • 23

  • 20.2

  • 21.2

MCQ
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उत्तर

21.2

Explanation:

`barx = (8 + 12 + 13 + 15 + 22)/5 = 14`

Calculation of variance

`bb(x_i)` `bb(x_i - barx)` `bb((x_i - barx)^2)`
8 −6 36
12 −2 4
13 −1 1
15 1 1
22 8 64

n = 5, `sum(x_i - barx)^2 = 106`

Var(x) = `1/n sum (x_i - barx)^2 = 106/5`

= 21.2

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