Hint: see problem 28.

(b) Suppose you took the appropriate random samples from each district and you got the following average political support measures (scale 0 to 10):
x1 5 6.2, x2 5 3.1 x3 5 8.5. Compute your best estimate for the population mean m (scale 0 to 10) of voter support for the issue from the total population of these three districts. Hint: see problem 28.