Whats the answer to part a and part b?

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years