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Mean - Grouped Data

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Question

Information on sales in a shop on various days is given. When sales on a festival day is included with the other sales, mean sales will

A

decrease

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B

increase

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C

remain the same

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Solution

The correct option is B increase
The given data is

1200, 1400, 1500, 1600

Sales without including festival sales:

1200, 1400, 1500

Mean = $\frac{1200 + 1400 + 1500}{3}$

= 1366.67

Mean including festival sales:

= $\frac{1200 + 1400 + 1500 + 1600}{3}$

= 1425

Hence, the mean of sales increases.

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