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Find the Mean and Variance for the First 10 Multiples of 3 - CBSE (Arts) Class 11 - Mathematics

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Question

Find the mean and variance for the first 10 multiples of 3

Solution

The first 10 multiples of 3 are

3, 6, 9, 12, 15, 18, 21, 24, 27, 30

Here, number of observations, = 10

xi `(X_i - barX)` `(X_i - barX)^2`
3 -13.5 182.25
6 -10.5 110.25
9 -7.5 56.25
12 -4.5 20.25
15 -1.5 2.25
18 1.5 2.25
21 4.5 20.25
24 7.5 56.25
27

10.5

110.25
30 13.5 182.25
    742.5


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Solution Find the Mean and Variance for the First 10 Multiples of 3 Concept: Variance and Standard Deviation - Standard Deviation.
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