Mathematics
The mean of following frequency distribution is . Find the value of 'f'. Class interval | Frequency ----- | ----- 0 - 10 | 8 10 - 20 | 22 20 - 30 | 31 30 - 40 | f 40 - 50 | 2
Related Questions
The following are the marks obtained by 70 boys in a class test.
Marks No. of boys 30 - 40 10 40 - 50 12 50 - 60 14 60 - 70 12 70 - 80 9 80 - 90 7 90 - 100 6 Calculate the mean by :
(i) Short-cut method
(ii) Step-deviation method
Find mean by 'step-deviation method' :
C.I. Frequency 63 - 70 9 70 - 77 13 77 - 84 27 84 - 91 38 91 - 98 32 98 - 105 16 105 - 112 15 Using the information given in the adjoining histogram; calculate the mean.
If the mean of the following observations is 54, find the value of p.
Class Frequency 0 - 20 7 20 - 40 p 40 - 60 10 60 - 80 9 80 - 100 13