The mean of 5 observations is 4.4 and their variance is 8.24. If three of the observations are 1, 2 and 6, find the other two observations.

Question

TextVariance of Ungrouped Data

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Find the variance of the following data: 6, 8, 10, 12, 14, 16, 18, 20, 22, 24

Find the mean and variance for the data: 6, 7, 10, 12, 13, 4, 8, 12

Find the mean and variance for the data: First n natural numbers

TextVariance of Ungrouped Data

Find the mean and variance for the data: First 10 multiples of 3

The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

If each of the observation x1, x2, ...,xn is increased by 'a', where a is a negative or positive number, show that the variance remains unchanged.