For a random variable that is normally distributed, with u = 200 and o = 20, determine the probability that a simple random sample of 4 items will have a mean that is:
a. greater than 210
b. between 190 and 230
c. less than 225
m = 200, s = 20
Standard error, SE = s/sqrt n = 20/sqrt 4 = 10
z = (x - ...
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