Question

Learning by doing
1. Find out the mean of the following distribution:
Items 0-5 5-10 10-15 15-20 20-25 25-30 30–35 35-40
Frequency 2 5 7 13 21 168 3
(Ans. X = 21.9)
2. Find arithmetic mean from the following distribution:
Marks
044
4-8
8-12
12-16
Number of Students
4
8
1
2
(Ans. X = 6 marks)
Measures of Central Tendenc
T.R. Jain
VK. Ohri​

Answer 1

By assumed mean method

-30,-50,-35=-115

105,+160+120+60=445