With the diagrams please
4. The Federal Reserve reports that the mean lifespan of a fivedollar bill is 4.9 years.   Let’s suppose that thestandard deviation is 2.1 years and that the distribution oflifespans is normal (not unreasonable!)
Find: (a) the probability that a $5 bill will last more than 4years.
(b) the probability that a $5 bill will last between 5 and 7years.
(c) the 94th percentile for the lifespan of thesebills (a time such that 94% of bills last less than that time).
(d ) the probability that a random sample of 37 bills has a meanlifespan of more than 5.1 years.
DON'T FORGET THE DIAGRAMS, PLEASE
