On the average, members at a local fitness center work out for 90 minutes with a standard deviation of 15 minutes. The distribution is normal. 9. What percentage of the fitness club members work out for 45 minutes or less? 10. What percentage of the fitness club members work out for 2 hours and 15 minutes or more? 11. 68% of the fitness club members work out between which two time intervals? 12. We can say that 99.85% of the fitness club members work out for no more than ____________ minutes.