3. ed and adelaide attend the same high school,
laide attend the same high school, but are in different math classes. the time e that
es ed to do his math homework follows a normal distribution with mean 25 minutes and
iard deviation 5 minutes. adelaide's math homework time a follows a normal distribution
with mean 50 minutes and standard deviation 10 minutes. assume that e and a are
independent random variables.
a.) randomly select one math assignment of ed's and one math assignment of adelaide's. let
the random variable d be the difference in the amount of time each student spent on their
assignments: d = a - e. find the mean and standard deviation of d. show your work.