CBSE Class 10-Mathematics: Chapter – 14 Statistics Part 12 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 4:

Draw a less than O give for the following frequency distribution.

Draw a Less Than O Give for the Following Frequency Distribution
MarksNo. of students

Answer:

We have

Draw a Less Than O Give for the Following Frequency Distribution
MarksFrequency (F)C. F
4
6
10
8
4
Draw a Less Than O Give for the Following Frequency Distribution
Upper class limits
Cumulative frequency
Plot the points

Join these points by a free hand curve. We get the required give which is as follows:

Join These Points by a Free Hand Curve

Question 5:

Find the mean age in years from the frequency distribution given below:

The Frequency Distribution
Age Total
Frequency

Answer:

We have

Find the Mean Age in Years from the Frequency Distribution Given Below
Class-IntervalMid value
Total

Let assumed mean ‘a’ , Here

We know that Mean