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

Draw the Ogive by plotting

Draw the Ogive by Plotting

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