Question

EXAMPLE 2 Find the mean of the following frequency distribution:
Classes:
0-20 20-40 40-60 60-80 80-100
Frequency:
15
18
21
29
17
by assumed mean method
​

Answer 1

Step-by-step explanation:

a=50

sigma of fi=90

sigma of fidi=500

Mean=a+sigma of fidi / sigma of fi

Mean= 50+500/90

Mean= 450+50/9

Mean=500/9

Mean=55.55