Every possible sample of 2 of these students is listed below. Complete the table. Ages Sample mean, x¯  80, 80    80, 55    80, 57    55, 80    55, 55    55, 57    57, 80    57, 55    57, 57    e) What is the the mean of all the sample means?

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Every possible sample of 2 of these students is listed below.

Complete the table.

Ages Sample mean, x¯ 
80, 80   
80, 55   
80, 57   
55, 80   
55, 55   
55, 57   
57, 80   
57, 55   
57, 57   


e) What is the the mean of all the sample means? 

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e.

The table can be calculated as follows:

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