The data of number of persons visiting a shopping mall in different hours of a day is collected and plotted as shown.

The average number of persons per hour visiting the mall between 0700 to 0900 hours is .

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Solution

The given data set is a grouped frequency distribution of the number of persons visiting a shopping mall at different hours of the day.

The first data point shows that $20$ persons visit the mall between $0700$ to $0900$ hours.

$0700$ to $0900$ hours is the combination of $0700$ to $0800$ hours and $0800$ to $0900$ hours, i.e., two hours.

Hence, each data point is data of two hours clubbed together.
$∴ 20$ persons visited in two hours.

Average number of persons per hour
$= \frac{Number of person visited in the given time period}{Number of hours}$
$= \frac{20}{2}$
$= 10$ persons per hour

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The data of number of persons visiting a shopping mall in different hours of a day is collected and plotted as shown. The average number of persons per hour visiting the mall between 0700 to 0900 hours is .

The data of number of persons visiting a shopping mall in different hours of a day is collected and plotted as shown.

The average number of persons per hour visiting the mall between 0700 to 0900 hours is .