Answer:
city mileage standard deviation for this SUV model is 2.34 mpg
Explanation:
given data
mean = 15.2 mpg
company indicated SUV more than 17 mpg = 22 %
to find out
city mileage standard deviation
solution
we know here that
P(Z > 0.77) is = 0.22
so here z is
z = 0.77
and
we use here z-score formula that is
mean x = z × +
................1
so
= ( x -
) ÷ z ................2
put here value and we get
=
= 2.34
so city mileage standard deviation for this SUV model is 2.34 mpg