Find a 90% confidence interval for the population standard deviation for the weights of men if a sample of 14 randomly selected men have a sample mean of 156.9 pounds and a sample standard deviation of 11.1 pounds. Assume that the population has a normal distribution.

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent. the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244