Some iq tests are standardized based on the assumption that the population mean is 100 and the standard deviation is 15. test graders decide to reject this hypothesis if a random sample of 25 people has a mean iq greater than 110. assuming that iq scores are normally distributed, what's the power of the test if the true population mean is 105?

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.