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 a 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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Solution

We may prepare the table as shown:

We know that mean,

Hence, mean = 8.1

Direct method is easier than other methods. Therefore, we used direct method.

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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.

$\begin{matrix} Number of plants & 0 - 2 & 2 - 4 & 4 - 6 & 6 - 8 & 8 - 10 & 10 - 12 & 12 - 14 Number of Houses & 1 & 2 & 1 & 5 & 6 & 2 & 3 \end{matrix}$

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

Q. A survey was conducted by a group of students in which they collected the following data regarding the number of plants in

30

houses in a locality. Find the mean number of plants per house.

Find median

Class interval 0-2. 2-4 4-6 6-8 8-10 10-12 12-14

Plants. 1. 2. 1. 5. 6. 2. 3

Q. A survey conducted on 20 households in a locality by a group of students resulted in the following frequency table for the number of family members in a household.

Family size	1-3	3-5	5-7	7-9	9-11
Number of families	7	8	2	2	1

The mode of this data 3.286

A survey conducted on $20$ households in a locality by a group of students resulted in the following frequency table for the number of family members in a household:

$\begin{matrix} FAMILY SIZE & 1 - 3 & 3 - 5 & 5 - 7 & 7 - 9 & 9 - 1 NUMBER & 7 & 8 & 2 & 1 & 2 OF FAMILIES \end{matrix}$

Find the mode of the data.

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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

We may prepare the table as shown: We know that mean, Hence, mean = 8.1 Direct method is easier than other methods. Therefore, we used direct method.

We may prepare the table as shown:

We know that mean,

Hence, mean = 8.1

Direct method is easier than other methods. Therefore, we used direct method.