AP Statistics Mixed Confidence Interval Practice

a. Compute a 50% confidence interval for the true mean gasoline used by the group of cars. b. Compute a 50% confidence interval for the true proportion of cars whose mileage is less than or equal to 25.0 mpg. 6. Home owners claim that the mean speed of automobiles traveling on Highland Hills Dr. is greater than the speed limit of 35 miles per hour. ................
................