Question 1119811
The standard error of the sample of 250 is sigma/sqrt (n) or 0.066/sqrt (250), and that is 0.0042
The rejection region is 0.110 from the mean in both directions.
The z-value for the rejection region is +/- 0.110/0.0042=2.62
This has a probability (both tails) of 0.0088.
For 250 coins, 250*0.0088=2.2
2 coins would be expected to be rejected.