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9 Maths Exercise Solutions

A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality, Find the mean number of plants per house.

Which method did you use for finding the mean and why?

Which method did you use for finding the mean and why?

Consider the following distribution of daily wages of workers of a factory.

Find the mean daily wages of the workers of the factory by using an appropriate method.

Find the mean daily wages of the workers of the factory by using an appropriate method.

The following distribution shows the daily. pocket allowance of children of a locality. The mean pocket allowance is

Find the missing frequency

Find the missing frequency

Thirty women were examined in a hospital by a doctor and the number of heartbeats per minute were recorded and summarized as follows. Find the mean heart beats per minute for these women, choosing a suitable method.

In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes.

Find the mean number of mangoes kept in a packing box. Which method of finding the mean did you choose?

Find the mean number of mangoes kept in a packing box. Which method of finding the mean did you choose?

The table below shows the daily expenditure of food of 25 households in a locality.

Find the mean daily expenditure of food by a suitable method.

Find the mean daily expenditure of food by a suitable method.

To find out the concentration ofin the air in parts per millionthe data was collected for localities in a certain city and is presented below

Find the mean concentration ofin the air

Find the mean concentration ofin the air

A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.

The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate.

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