Q1 of 25 Page 332

A survey was conducted by a group of students as a part of their environment awareness programmed, 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.

Let’s find mean of the data using direct method.

First, construct a table for ease of calculation.



Mean is given by



⇒ Mean = 162/20


⇒ Mean = 8.1


Thus, mean number of plants per house is 8.1.


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2

Consider the following distribution of daily wages of 50 workers of a factory.


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

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The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is ` 18. Find the missing frequency f.

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

 5

In a retail market, fruit vendors were selling oranges kept in packing basket. These baskets contained varying number of oranges. The following was distribution of oranges.


Find the mean number of oranges kept in each basket. Which method of finding the mean did you choose?