1. Let X = tips earned by a pizza delivery person in a day. Xfollows a normal distribution with a mean of $75 and a variance of $625.
   1. If a delivery person earns $88, how many standard deviations are their earnings away from the mean?
   2. If a delivery person earns $75, how many standard deviations are their earnings away from the mean?
   3. Calculate the following probabilities:
      1. 

P(20 120P(70