Question

Fuel economy estimates for automobiles built one year predicted a mean of 28.2mpg and a standard deviation of 4.8mpg for highway driving. Assume that a Normal model can be applied. Use the 68−95−99.7 Rule to complete parts b) through e). b) In what interval would you expect the central 99.7% of autos to be found. Using the​ 68-95-99.7 rule, the central l99.7​%of autos can be expected to be found in the interval from __- to __ MPG c) what percent of autos should get more than 33mpg Usign the 68-95 rule about __% of autos should get more than 33mpg D) what percent of autos should get between 33 and 37.8mpg E) Describe the gas milage of the best 2.5% of cars a) they get more than 42.6mpg b) they get less than 23.4 mph C) they get more than 33 mpg D) they get more than 37.8 mpg

Answer 1

See below

Explanation:

a) The central 99.7% of autos are expected to be found in the interval from 13.8 mpg to 42.6 mpg.

c) About 32% of autos should get more than 33 mpg.

d) The percentage of autos that should get between 33 and 37.8 mpg is 32%.

e) The best 2.5% of cars get more than 42.6 mpg.