mean being 19 units :
x 5-10
3
2
Solution
Let the frequency of the class 15-20 be
4 Determine the frequency of the
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Answer:
the mean, first we have to find the mid-point of each class interval. Mid-point of each class interval. Mid-point of 0−4=(0+4)/2=2; mid-point of 5−9=(5+9)/2=7 and the like. Denote the mid-point of the class interval by x. Write down the frequencies f corresponding to each class interval.
Class interval Mid-point of CI (x) Frequency (f) fx
0−4 2 3 6
5−9 7 5 35
10−14 12 7 84
15−19 17 4 68
20−24 22 6 132
N=25 ∑fx=325
Multiply f and x to get fx. Add all fx and find out ∑fx. Now the mean is calculated using the formula.
X
=
total number of scores
sum of all scores
=
N
∑fx
Thus we get
X
=
N
∑fx
=
25
325
=13.
Therefore mean is 13.
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