A poll was taken of 12,664 working adults aged 40-70 to determine their level of education. The participants were classified by sex and by level of education. The results are shown below. Education Level Male Female Total
High School or Less 2876 3812 6688
Bachelor's Degree 2149 2895 5044
Master's Degree 433 396 829
Ph. D. 46 57 103
Total 5504 7160 12,664

A person is selected at random. Compute the following probabilities.

(a) What is the probability that the selected person is a male?

(b) What is the probability that the selected person does not have a Ph. D.?

(c) What is the probability that the selected person has a Master's degree?

(d) What is the probability that the selected person is female and has a Master's degree?

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.