4. In a typical season, an MLB baseball player gets 550 at bats and has a 0.300 chance of getting a hit each time they have an at-bat. Let X = the number of hits the player gets next season. a) Calculate the mean and standard deviation for the number of hits the player is expected to get in 550 at-bats. b) Interpret the standard deviation. c) Justify the distribution of X is approximately normal. d) Calculate the probability that the player has at least 160 hits