The ACT Scale is composed of a number of sub tests. On one sub test, the raw scores have a mean of 28 and a standard deviation of 4. Assuming these raw scores form a normal distribution: a. What score separates the lower 45% of the distribution?
b. What number represents the 95th percentile (95% and below)?
c. What is the probability of getting a raw score between 22 and 30?
d. What is the probability of getting a raw score greater than 38?

A. the probability that a product is defective is 0.1. what is the probability that there will be 1 or less defective products out of the next 8 produced products b.the expected number of imperfections in the coating nylon for parachutes is 6 per 100 yards. what is the probability of finding 12 or fewer imperfections in 260 yards c.in a lot of 54 products there are 9 defective products. calculate the probability that not more than 1 is defective from a random sample of 17 products.