Grace has 3 wheels of cheese and she wants to eat an equal amount each day for 12 days. So each wheel needs to last 12/3 = 4 days. So then she can eat 1 wheel/4 days = 1/4 wheel per day.
(a) someone over 55 mean, mu = 22 standard deviation, sigma = 2 X=19 Z(X)=(X-mu)/sigma=(19-22)/2=-1.5 P(x>X)=1-P(x<X)=1-0.0668072=0.9331928 Therefore probability for a 55-year old to find a job in over 19 weeks is 0.9332
