Questions 10-14

owing to answer questions 10 and 11. Runner's World reports that the times of the finishers in the New York City 10-km run are normally distributed with a mean of 55 minutes and a standard deviation of 5 minutes. this proportion. 10. Find the proportion of runners who take more than 65 minutes to finish. Draw a sketch to show 1 1. Find the proportion of runners who finish in less than 45 minutes. Draw a sketch to show this proportion. 12. In a study of television viewing habits it was found that a sample watched on average 10 hours of television per week. The standard deviation was found to be 2 hours. a. Estimate the percentage of people that viewed between 6 and 16 hours of television. b. 95% of the persons watched between and hours of television. 13. The average amount spent by boys on their prom is $325 with a standard deviation of $35. According to the Empirical Rule, 95% of the boys will spend between and The average amount of water consumed by track members during a meet is 2.5 Liters with a standard deviation of 1.0 L. According to the Empirical Rule, approximately _% will drink between 1.5 L and 3.5 L