Your store wraps gifts 2 hour after they are recieved. The distribution of times is approximately normal, the standard deviation is 15 mins, today you wrapped 120 gifts (Empirical rule).
a. how many gifts would expect to wrap within 2 hours 15 mins of being received.
b. how many gifts would you expect to be wrapped within 1 hour 45 mins?
Mean = 2 hours
Std Deviation = 15 mins or .25 hours
No of orders handled = 120