12. Fix-It Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are

12.Fix-It Copiers advertises a mean time of 100 minutes for office calls with a standard deviation of 25 minutes. What percentage of calls are completed:a.between 100 and 120 minutes?b.in less than 120 minutes?c.in less than 60 minutes?d.between 120 and 150 minutes?