Use the empirical rule to answer the following: Monthly maintenance costs are distributed normally with a µ=$250 and σ=$50. 1) What percent of months have maintenance costs in the range of $200 to...

Use the empirical rule to answer the following:  Monthly maintenance costs are distributed normally with a µ=$250 and σ=$50.

1) What percent of months have maintenance costs in the range of $200 to $300?

2) What is the chance (i.e. probability) that a randomly chosen month has a maintenance cost of $150 or less?

Show your work.