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.

Following Table Shows the Daily Pocket Allowances Given to the Children of a Multi-Story Building. The Mean of the Pocket Allowances is ₹ 18. Find Out the Missing Frequency
Class Interval
Frequency

Answer:

Let the missing frequency , we have

Following Table Shows the Daily Pocket Allowances Given to the Children of a Multi-Story Building. The Mean of the Pocket Allowances is ₹ 18. Find Out the Missing Frequency
Class intervalMid-value
11 - 13312-3-9
13 - 15614-2-12
15 - 17916-1-9
17 - 19131800
19 - 21f201F
21 - 32522210
23 - 25424312

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.

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

Answer:

We have,

Find the Median Height
Class IntervalsFrequency (f)C. F
Below

Here, which is in the class

Here,

Median height of the girls