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Question

The variance of 3,6,9,.,30 is

A
72.45
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B
74.25
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C
54.36
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D
48.37
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Solution

The correct option is B 74.25
σ2=32+62+...+30210(3+6+....+3010)2
=9(385103025100)=9(38503025100)
=74.25

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