Question

EXAMPLE2 Find the mean of the following frequency distribution:
Classes:
0-20 20-40 40-60 60-80 80-100
Frequency: 15
18
21
17
Calculation of Mean by direct method​

Answer 1

Answer:

80-100. Frequency: ... We then find the sum of all the frequencies and the multiplication of frequency of each class with the mid-point of that class. We then use formula of the mean of the grouped frequency distribution is given as ¯x=∑fixi∑fi to find the mean of the frequency distribution.

Answer 2

Step-by-step explanation:

here frequencies are only four but class interval is 5 please check the question....