He blood platelet counts of a group of women have a bell-shaped distribution with a mean of 252.5 and a standard deviation of 65.9 . (All units are 1000 cells/mu L.) Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of women with platelet counts within 1 standard deviation of the mean, or between 186.6 and 318.4 ? b. What is the approximate percentage of women with platelet counts between 54.8 and 450.2 ?

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?