



 
Hi Liz, You need to check your calculations again. The mean of the population is 4 not 2. For part a the number of samples of size 3 is the number of ways of choosing 3 things from 7 things, sometimes called 7 choose 3 and written _{7}C_{3}. Do you know how to calculate this? For b part you need to list all the samples you counted in part a. Do so in an orderly way. I would start
For each sample in the list find the mean and median. I hope this helps,  


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