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Question 1:

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.

Number of plants

0­ − 2

2­ − 4

4 − 6

6 − 8

8 − 10

10 − 12

12 − 14

Number of houses

1

2

1

5

6

2

3

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

Answer:

To find the class mark (xi) for each interval, the following relation is used.

Class mark (xi) =

xi and fixi can be calculated as follows.

Number of plants

Number of houses

(fi)

xi

fixi

0­ − 2

1

1

1 × 1 = 1

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