I need solving for this problem and need explanation on solving it thank you in advance

7. [1/3 Points] DETAILS PREVIOUS ANSWERS BBBASICSTAT8 6.R.009. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER 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 10.6% 25-36 38.8% 37-48 25.3% 49-60 25.0% More than 60 0.3% (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 months standard deviation (b) Sketch a graph of the probability distribution for the duration of new auto leases. 30 30 1 of Leases 20 of Leases 20 10 10 Maple Generated Plot MacBook Air