5
19. Calculate the Arithmetic Mean of the following frequency distribution:
No. of students
Marks
Less than 10
4
10-20
6
20-30
20
30-40
10
40-50
7
More than 50
3
Answers
Answered by
0
Answer:
8.33
Explanation:
Arithmetic mean = Sum of all observations / No. of observations
(4+6+20+10+7+3) / 6
50/6
8.33
Answered by
0
Answer:
class interval frequency (f) mean value (x) fx
0 - 10 7 5 35
10 - 20 14 15 210
20 - 30 28 25 700
30 - 40 26 35 910
40 - 50 19 45 720
50 - 60 9 55 495
Sum 100 3070
A.M.=
∑f
i
∑f
i
x
i
=
100
3070
=30.7
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