Test Academy | If the mean of 15 observations is 12 and standard deviation is 3. If 12 is replaced by 10 (in data) then the new mean is μ and variance is σ 2 then what is the value of 15 (μ + μ 2 + σ 2 )

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If the mean of 15 observations is 12 and standard deviation is 3. If 12 is replaced by 10 (in data) then the new mean is μ and variance is σ² then what is the value of 15 (μ + μ² + σ²)

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