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Question

Find the mean of the squares of the first seven whole numbers.


A
10
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B
13
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C
50
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D
91
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Solution

The correct option is B 13
The first 7 whole numbers are 0, 1, 2, 3, 4, 5, 6, 7.
Squares of first 7 whole numbers are 0, 1, 4, 9, 16, 25, 36.
Mean=sum of observationsNumber of students

=(0+1+4+9+16+25+36)7

=(91)7

Mean=13

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