6. The mean of forty sales receipts is $69.75 and the standard deviation is $10.25. Using Chebysheff's theorem, of the sales receipts were less than $49.25.

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?