Example 3-12: Find the variance and standard deviation for the data set for brand A paint in Example 3-11. D 10, 60, 50, 30, 40, 20 N 6 SOLUTION 1. Find the mean for the data 2. Subtract the mean from each data value mean- 3. Square each result 4. Find the sum for the squares 5. Divided the sum by N to get the variance 6. Take the square root of the variance (S2) to get the standard deviation (S)

Q: Ques 3 ,4 and 5

A: This is a basic problem of central tendency . It is very useful.

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