0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method.
Number of heart beats per minute
6568
6871
7174
7477
7780
8083
8386
Number of women
2
4
3
8
7
4
2

Solution
Verified by Toppr

Class interval Mid value (xi) (fi)ui=xi75.53 fiui
6568 66.5 2 36
6871 69.5 4 2 8
7174 72.5 3 1 3
7477 75.5 8 0 0
7780 78.5 7 1 7
8083 81.5 4 2 8
8386 84.5 2 3 6
Total 30 4
Lets take assumed mean, A as 75.5
Class interval =3

ui=xiAh=xi75.53

¯x=A+hfiuifi=75.5+3×430=75.5+0.4=75.9

Hence, the mean heart beats per minute for these women is 75.9

Was this answer helpful?
105
Similar Questions
Q1
Thirty women were examined in a hospital by a doctor and the number of heart beats per minute were recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method.
Number of heart beats per minute
6568
6871
7174
7477
7780
8083
8386
Number of women
2
4
3
8
7
4
2
View Solution
Q2

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

Number of heart beats per minute68­7171747477778080838386Number of Women2438742

View Solution
Q3

Question 4
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 minute6568687171747477778080838386Number of women2438742

View Solution
Q4
Thirty women were examined in a hospital by a doctor and the number of heart beats per minute recorded and summarised as follows. Find the mean heat beats per minute for these women, choosing a suitable method.
Number of heart beats per minute: 65-58 68-71 71-74 74-77 77-80 80-83 83-86
Number of women: 2 4 3 8 7 4 2
View Solution
Q5

Question 4
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 minute6568687171747477778080838386Number of women2438742


View Solution