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Standard XI
Statistics
Direct Method
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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


Sales (in dollars) \begin{tabular}{|c|c|c|c|} \hline Normal day & Weekend & Holiday & Festival day \\ \hline 1200 & 1400 & 1500 & 1600 \\ \hline \end{tabular}

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 = 1200+1400+15003

= 1366.67

Mean including festival sales:

= 1200+1400+1500+16003

= 1425

Hence, the mean of sales increases.

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