Question

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

Answer 1

The z for $60.00 = -2.2

The percent of area associated with $60.00 = 48.6%

The z for $390.00 = 2.2

The percent of area associated with $390.00 = 48.6%

Adding the two percentages together, Peter calculates his answer to be: 97.2%