Question

Calculate arithmetic mean of the following series: (Use direct and short-cut methods)
Class interval 30-59 60-89 90-119 120-149 150-179 180-209 210-239
frequency
4
7
12
15
18
6
5​

Answer 1

Answer:

Calculate arithmetic mean of the following series: (Use direct and short-cut methods)

Class interval 30-59 60-89 90-119