Please solve this
Asked by aastharoy997 | 14th May, 2020, 10:08: AM
Question: The average of 25 observations is 80 and the average of another 55 observations is 65. Find the approximate average of all these observations.
Let the sum of 25 observations be a.
As the average is 80, we have
a = 25 x 80 = 2000
Let the sum of next 55 observations be b.
As the average is 65, we have
b = 55 x 65 = 3575
The total number of observations is 25+55=80.
Sum of all the observations is a+b=2000+3575
Average of these 80 observations is = 5575/80 = 69.68 = 70 (approximately)
Approximate average of all these observations is 70.
Answered by Renu Varma | 14th May, 2020, 11:58: AM
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