School is organized slogan competition on "SAVE ENVIRONMENT” for all classes. The following frequency distribution gives the number of slogans submitted by all the students:
No. of slogans 11-15 16-20 21-25 26-30 31-35 36-40 41-45 46-50
No. of Students 2 3 6 1 7 14 12 4 2
Find the mean, variance and standard deviation.
Answers
Given : slogan competition on "SAVE ENVIRONMENT” frequency distribution gives the number of slogans submitted by all the students:
To find : Mean of Data
Solution:
No. of slogans f Mean Slogan A= (mean -28)/5 f * A
11-15 2 13 -3 -6
16-20 3 18 -2 -6
21-25 6 23 -1 -6
26-30 7 28 0 0
31-35 14 33 1 14
36-40 12 38 2 24
41-45 4 43 3 12
46-50 12 48 4 48
60 80
Mean = 28 + 5 * ( 80)/ 60
= 28 + 6.67
= 34.67
Mean number of Solgans = 34.67
Learn more:
Find the mean deviation about mean for the following distribution ...
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