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Question
If the mean of the data 7, 7, 9, 7, 8, 7, λ, 8 is 7, then the variance of this data is ______.
Options
`5/4`
`7/4`
`1/4`
`11/4`
MCQ
Fill in the Blanks
Solution
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`
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Standard Deviation
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