Question

The following distribution shows the daily pocket allowance given to the children of a multistory building. The average pocket allowance is Rs. 18.00. Find out the missing frequency.
class interval: 11-13 13-15 15-17 17-19 19-21 21-23 23-25
Frequency: 7 6 9 12 - 5 4

Answer 1

Statistics

Statistics is a branch of mathematics that deals with the collection, organization, interpretation, and presentation of data in a required manner.

Some common Statistical Terms :-

• Mean
• Median
• Mode
• Standard Deviation
• Variance

Here, we are going to solve a question based on mean.

Let the missing frequency be x.

Mean = Σfixi/Σfi

Now, in the question the mean is given which is 18.

So,

18 = (734+20x)/(43+x)

By cross-multiplying we get :-

774 + 18x = 734 + 20x

774 - 734 = 20x - 18x

40 = 2x

x = 20

So, the missing frequency is 20.

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