please hurry up

aller the next 90 days, economists forecast that the pound may strengthen relative to the dollar by as much as 12%, or it may weaken by as much as 9%. The possible values for the rate of change of the dollar-pound spot exchange rate are 9% -4%, 0%, 5%, and 12%. If these values are equally likely, what are the mean and standard deviation of the future spot exchange rate if the current rate is $1.7/? Select one: a. $0.5836/; $0.1160/ b. $1.7136/; $0.1232/ c. $1.6640/; $0.1232/ d. $0.6200/E, $0.1160/