Two pyramids like the one below sit on top of the gates at the entrance to the bridge.

A square pyramid. The base is 10 inches by 10 inches. The triangular sides have a base of 10 inches and height of 13 inches. The pyramid has a height of 12 inches.

Which expression shows how to determine the minimum amount of cement used to make each of the pyramids?

One-third (10) (10) (12)

One-half (10) (10) (12)

4 (one-half (10) (13)) + 10 (10)

4 (one-third (10) (13)) + 10 (10)

An engineer is going to redesign an ejection seat for an airplane. the seat was designed for pilots weighing between 120 lb and 161 lb. the new population of pilots has normally distributed weights with a mean of 125 lb and a standard deviation of 28.1 lb. a)if a pilot is randomly selected, find the probability that his weight is between 120 lb and 161 lb.the probability is approximately? b. if 36 different pilots are randomly selected, find the probability that their mean weight is between 120 lb and 161 lb. the probability is approximately? c. when redesigning the ejection seat, which probability is more relevant? . part (b) because the seat performance for a single pilot is more important. b. part (b) because the seat performance for a sample of pilots is more important. c. part (a) because the seat performance for a sample of pilots is more important. d. part (a) because the seat performance for a single pilot is more important.