Peter pine is doing his budget. he discovers that he has spent an average of $225.00 a month on entertainment for the year with a standard deviation of $75.00. what percent of his monthly expenses for this category would he expect to fall between $60.00 and $390.00?
a) the z for $60.00 = - a0.
b) the percent of area associated with $60.00 = a1 %.
c) the z for $390.00 = a2.
d) the percent of area associated with $390.00 = a3 %.
e) adding the two percentages together, peter calculates his answer to be a4