CBSE Class 10-Mathematics: Chapter –14 Statistics Part 14
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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.
Number of heart beats per minute | No. of women |
Answer:
Let assumed mean . We have
No. of heart beats per minute | No. 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:
Marks | ||||||
Frequency |
Change the distribution to less than type distribution and draw its O give.
Answer:
Less than type O give
Marks | Marks | Frequency | Cumulative 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