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CBSE Class 10- Mathematics: Chapter – 14 Statistics Part 14

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

Answer:

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
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
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

Illustration: CBSE Class 10- Mathematics: Chapter – 14 Statistics Part 14