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

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Question 9:

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarized as follows. Find the mean heart beats per minute for these women choosing a suitable method.

Thirty Women Were Examined in a Hospital
Number of heart beats per minuteNo. of women


Let assumed mean . We have

Let Assumed Mean
No. of heart beats per minuteNo. of women Class Mark mid value

We know that

Mean [By step Deviation Method]

Question 10:

Following distribution shows the marks obtained by a class of students:

Following Distribution Shows the Marks Obtained

Change the distribution to less than type distribution and draw its O give.


Less than type O give

Less Than Type O Give
MarksMarksFrequencyCumulative Frequency
Less than 20
Less than 30
Less than 40
Less than50
Less than 60
Less than 70

Now, draw the Ogive by plotting

Draw the Ogive by Plotting