A society organised drawing compitition on 'covid-19' for all children. The following frequency distribution table gives the data of number of children and their age group age 6-7, 7-9, 9-11, 11-13, 13-15, no. of childeren 6 3 9 5 7. estimate the mean age group a) 6 b) 5 c) 4 d) 6.5. What is the upper limit of modal class a)7 b) 11 c) 13 d) 15. Comulative frequency of class interval 11-13 a) 18 b) 30 c) 9 d) 23. class mark of interval 13-15 a)6 b) 14 c) 10 d) 12. The sum of upper limit and lower limit of median class. a) 12 b) 10 c) 20 d) 28.
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Given : A society organised drawing compitition on 'covid-19' for all children.
data of number of children and their age
group age 6-7, 7-9, 9-11, 11-13, 13-15,
no. of children's 6 3 9 5 7.
To Find :
What is the upper limit of modal class a)7 b) 11 c) 13 d) 15.
Cumulative frequency of class interval 11-13 a) 18 b) 30 c) 9 d) 23.
class mark of interval 13-15 a)6 b) 14 c) 10 d) 12.
The sum of upper limit and lower limit of median class. a) 12 b) 10 c) 20 d) 28.
Solution:
group age Mean Frequency CF Mean * f
6-7, 6.5 6 6 39
7-9, 8 3 9 24
9-11, 10 9 18 90
11-13, 12 5 23 60
13-15 14 7 30 98
30 311
mean age group of 6-7 is 6.5
Modal Class - 9 - 11
upper limit of modal class = 11
Cumulative frequency of class interval 11-13 = 23
class mark of interval 13-15 = 14
median class. =9 - 11
the sum of upper limit and lower limit of median class.
9 + 11 = 20
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