Q. 34.2( 38 Votes )

# The number of members in the 40 families in Bhilar are as follows:

1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2, 3, 5, 6, 4, 2. Prepare a frequency table and find the mean of members of 40 families.

Answer :

1. Write the scores in the 1st column, in ascending order as x_{1}< x_{2}< x_{3}...

2. Write the tally marks in the next column.

3. Count the tally marks of scores and write the frequency of the score, denoted as f_{i}.

4. Write the sum of all frequencies below the frequency column.

5. The total frequencies are denoted by ‘N’.

6. In the last column write the products f_{i}.x_{i}. Find Σ f_{i} x_{i}.

Formula

Where, x_{i} = score ; fi = frequency ; N = total frequency.

∴ Mean

= 156/40

= 3.9

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