A regional airline carrier determined that the number of kms travelled per airplane per year is normally distributed with a mean of 700 thousand kms and a standard deviation of a 100 thousand kms. a)...

A regional airline carrier determined that the number of kms travelled per airplane per year
is normally distributed with a mean of 700 thousand kms and a standard deviation of a 100
thousand kms.
a) What percentage of the planes is expected to travel between 450 and 700 thousand kms
in a year?
b) Find the maximum distance in kms travelled by 70% of the planes.