What is the Arithmetic mean of the given data :
45, 48 , 53 , 55 , 58 , 63 , 68 and 66

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Solution

The correct option is B
57

Mean = $\frac{S u m o f o b s e r v a t i o n s}{N o . o f O b s e r v a t i o n s}$

= $\frac{45 + 48 + 53 + 55 + 58 + 63 + 68 + 66}{8}$

= $\frac{456}{8}$

= 57

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