Question

If the mean of the data 7, 7, 9, 7, 8, 7, λ, 8 is 7, then the variance of this data is ______.

पर्याय

• `5/4`

• `7/4`

• `1/4`

• `11/4`

Answer 1

If the mean of the data 7, 7, 9, 7, 8, 7, λ, 8 is 7, then the variance of this data is `underlinebb(11/4)`.

Explanation:

Mean: `(28 + 16 + 9 + λ)/8` = 7

λ = 3

Variance: σ² = `(2^2 + 1^2 + 4^2 + 1^2)/8`

σ² = `11/4`

Variance = `11/4`