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

Given: Total Items are 50 and the mean is 15.

To Find: Find the mean of first sample?

Solution:

• Now we have given that the second of the two samples is having 50 items and the mean of those 50 items is 15.

• So the sum of items will be:

          15 x 50 items =  750

• Now we have given that the total items are 150 and the mean is 16.

• So the sum will be:

          16 x 150 items = 2400

• Now, the sum of first sample is = Total items - first sample

          2400 - 750

          = 1650

• The items are: 150 - 50 = 100

• The mean of first sample = the sum of first sample / 100

         1650 / 100

         = 16.5

Answer:

              So, the mean of first sample IS 16.5

Answer 2

Answer:

Step-by-step explanation:

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