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Question

The number of cars sold in 5 consecutive days are given as 11, 12, 10, 8, 9. Find it's standard deviation using mean method.

A
1.41
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B
3.23
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C
5.26
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D
6.45
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Solution

The correct option is A 1.41
Arranging the numbers in ascending order, we get, 8, 9,10, 11,12.

Mean
=¯x=8+9+10+11+125=505=10

xidi=xi¯xdi2=xi1082491110001111122410

Standard Deviation

σ=di2n

=105

=21.41

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