Question: One sample has a mean of M = 4 and a second sample has a mean of M = 8. The two samples are combined

One sample has a mean of M = 4 and a second sample has a mean of M = 8. The two samples are combined into a single set of scores.
a. What is the mean for the combined set if both of the original samples have n = 7 scores?
b. What is the mean for the combined set if the first sample has n = 3 and the second sample has n = 7?
c. What is the mean for the combined set if the first sample has n = 7 and the second sample has n = 3?

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