1. Summarize when it would and would not be reasonable to assume that the sampling distribution of M is normal.
2. For the values
59, 106, 174, 207, 219, 237, 313, 365, 458, 497, 515, 529, 557, 615, 625, 645, 973, 1065, 3215,
estimate the standard error of the 20% trimmed mean.