Asample of 400 racing cars showed that 80 cars cost over $700,000. what is the 99% confidence interval of the true proportion of cars costing over $700,000

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?