# CBSE Class 10-Mathematics: Chapter – 14 Statistics Part 15 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 11:

Following table shows the daily pocket allowances given to the children of a multi-story building. The mean of the pocket allowances is . Find out the missing frequency.

 Class Interval Frequency

Let the missing frequency , we have

 Class interval Mid-value 11 - 13 3 12 -3 -9 13 - 15 6 14 -2 -12 15 - 17 9 16 -1 -9 17 - 19 13 18 0 0 19 - 21 f 20 1 F 21 - 32 5 22 2 10 23 - 25 4 24 3 12

Let assumed mean , Here

We know that mean

Hence, missing frequency

Question 12:

A survey regarding the heights (in cm) of girls of Class of a school was conducted and the following data was obtained. Find the median height.

 Height (in cm) No. of girls Less than 140 Less than 145 Less than 150 Less than 155 Less than 160 Less than 165