Reference no: EM132377075
1. Based on the model ?N(1158?,87?) describing steer? weights, what are the cutoff values for
?a) the highest? 10% of the? weights?
?b) the lowest? 20% of the? weights?
?c) the middle? 40% of the? weights?
2. Use the Normal model ?N(1113?,82?) for the weights of steers.
?a) What weight represents the 33rd ?percentile?
?b) What weight represents the 93rd ?percentile?
?c) What's the IQR of the weights of these? steers?
3. 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.
About what percent of autos should get more than 31 ?mpg?
Using the? 68-95-99.7 rule, about _____?% of autos should get more than 31 mpg.