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,
.
0-2
Number of plants
2-4
6-8
8-10
12-14
10-12الح
Number of houses
1
5
6
2
w
​

Answer 1

Step-by-step explanation:

STATISTICS

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Asked on December 20, 2019 by

Zainab Jhamb

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?

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ANSWER

Answer: Using direct method to calculate mean :

No. of plants No. of houses x

i

f

i

.x

i

0-2 1 1 1

2-4 2 3 6

4-6 1 5 5

6-8 5 7 35

8-10 6 9 54

10-12 2 11 22

12-14 3 13 39

Σf

i

=20 Σf

i

.x

i

=162

Mean=

Σf

i

Σf

i

.x

i

=

20

162

=8.1plants

We used direct method for finding the mean as the width of the class is very small and also the frequency for each class have very small values. Thus, it will be easy to calculate.