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.

Thirty women were examined in a hospital
Number of heart beats per minute	No. of women

Answer:

Let assumed mean . We have

Let assumed mean
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:

Following distribution shows the marks obtained
Marks
Frequency

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

Answer:

Less than type O give

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