Question

1.) The Economic Policy Institute reports that the average entry-level wage for male college graduates is $20.56 per hour and for female college graduates is $17.81 per hour. The standard deviation for male graduates is $3.77 and for female graduates is $2.95. Assume wages are normally distributed.  If 52 male graduates are chosen, find the probability the sample average entry-level wage is at least $19.88

2.) On the SAT, the average Writing score is 478 points and the average Mathematics score is 528 points. The standard deviation is 92 points on each part of the test. Now suppose 37 test takers are selected.99% of the time the sample average Mathematics score should be less than what?

3.) 29% of consumers read the ingredients listed on a product's label. For a sample of 265 customers, what is the probability that between 69 and 85 of them read the ingredients listed on a product's label?

Answer 1