Reference no: EM132377079

A. Fuel economy estimates for automobiles built one year predicted a mean of 25.8 mpg and a standard deviation of 5.2 mpg for highway driving. Assume that a Normal model can be applied. Use the 68-95-99.7 Rule to complete. In what interval would you expect the central 68?% of autos to be? found? Using the? 68-95-99.7 rule, the central 68?% of autos can be expected to be found in the interval from ____ to _____ mpg.

B. A livestock company reports that the mean weight of a group of young steers is 1096 pounds with a standard deviation of 80 pounds. Based on the model ?N(1096?,80?) for the weights of? steers, what percent of steers weigh

1) over 1050 ?pounds?

2) under 950 ?pounds?

3) between 1100 and 1200 ?pounds?

C. Use the Normal model ?N(100?,16?) describing IQ scores to answer the following.

1) What percent of? people's IQs are expected to be over 85??

?2) What percent of? people's IQs are expected to be under 90??

3) What percent of? people's IQs are expected to be between 108 and 124??