Question

The second of the two samples has 50 items with mean 15. If the whole group has 150 items with mean 16, find the mean of first sample?

Answer 1

Step-by-step explanation:

mean of second sample = 15

items = 50

sum of items = 750

total items = 150

mean = 16

sum = 2400

therefore, sum of first sample = (2400-750) = 1650

items = (150-50) = 100

mean of first sample = 1650/100 = 16.5

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