Layla earned a score of 140 on Exam A that had a mean of 200 and a standard deviation of 50. She is about to take Exam B that has a mean of 650 and a standard deviation of 20. How well must Layla score on Exam B in order to do equivalently well as she did on Exam A? Assume that scores on each exam are normally distributed

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.