Need help these problems for my statistics class.

9. (10 points) According to ightstats.com, American Airlines ights from Dallas to Chicago are on time 85% of the time. Suppose 14 ights are randomly selected, and the number of ontime ights is recorded. (a) (3 points) Find the probability that exactly 11 ights are on time. (b) (3 points) Find the probability that at most 11 ights are on time. (c) (2 points) Calculate the mean, a. (d) (2 points) Calculate the standard deviation, 0. 10. (10 points) According to Major League Baseball rules, the ball must weigh between 5.12 and 5.24 ounces. A factory produces baseballs whose weights are approximately normally dis tributed, with a mean of 5.13 ounces and standard deviation of 0.04 ounces. (a) (3 points) What proportion of the baseballs produced by this factory are too light for use by Major League Baseball? (b) (3 points) What proportion of the baseballs produced by this factory can be used by Ma jor League Baseball? (c) (4 points) After exhaustive study it has been found that baseballs produced by the fac tory that lies in the interquartile range (IQR) are ones that travel the furthest when hit. Determine the range of weights for the baseball in the IQR. Determine the 25th percentile (quartile 1) and the 75th percentile(quartile 3) of baseball's weight produced by the factory