Consumer Banker Association released a report showing the lengths of automobile leases for new automobiles. The results are as follows.
Lease Length in Months Percent of Leases

13-24
25-36
37-48
49-60
More than 60

13.0%
35.2%
25.0%
26.4%
0.4%

(a) Use the midpoint of each class, and call the midpoint of the last class 66.5 months, for purposes of computing the expected lease term. Also find the standard deviation of the
distribution. (Round your answers to two decimal places.)
expected lease term =
standard deviation =