mean of marks of 20 students whose total sum os 257
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Step-by-step explanation:
mean = total sum / total number
mean = 257/20
=12.85 answer
Answered by
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Step-by-step explanation:
The mean of the combined populations is 47.
The problem is solved by calculating a weighted average. Multiply the mean by the population for each of the populations. Sum the products, then divide the sum of the products by the sum of the populations. The result is the answer you are looking for.
20 X 52 = 1040
25 x 43 = 1075
1040 + 1075 = 2115
20 + 25 = 45
2115 / 45 = 47
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