Question

Weight of 15 persons is as follows:
Weight kg: 20,28,34,38,42,50,53,54,59,64,72,74,74,78,79:
Find out mean weight, using Direct method as well as shortcut method.

Answer 1

Given:

Weight of 15 persons is as follows:

Weight kg: 20,28,34,38,42,50,53,54,59,64,72,74,74,78,79

To find:

calculate the mean

Solution:

Finding the sum of the given observations:

20 + 28 +34 + 38 + 42 + 50 + 53 + 54 + 59 + 64 + 72 + 74 + 74 + 78 + 79=819

Finding the mean:

Mean = sum of observations/total observations

Mean = 819/15

Mean = 54.6

Hence, the required answer is 54.6