Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, the mean annual salary for graduates 10 years after graduation is 145000 dollars and the standard deviation is 39000 dollars. Suppose you take a simple random sample of 65 graduates. Assume that the population of all salaries for MBA graduates is normally distributed. A. Find the probability that a single randomly selected policy has a mean value between 139252 and 141171.3 dollars.
B. Find the probability that a random sample of size n = 98 has a mean value between 139252 and 141171.3 dollars.

What expression is equivalent to 42x-56y

Find the constant of variation for the relation and use it to write an equation for the statement. then solve the equation.

In a test for esp (extrasensory perception), the experimenter looks at cards that are hidden from the subject. each card contains either a star, a circle, a wave, a cross or a square.(five shapes) as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. when the esp study described above discovers a subject whose performance appears to be better than guessing, the study continues at greater length. the experimenter looks at many cards bearing one of five shapes (star, square, circle, wave, and cross) in an order determined by random numbers. the subject cannot see the experimenter as he looks at each card in turn, in order to avoid any possible nonverbal clues. the answers of a subject who does not have esp should be independent observations, each with probability 1/5 of success. we record 1000 attempts. which of the following assumptions must be met in order to solve this problem? it's reasonable to assume normality 0.8(1000), 0.2(1000)%30 approximately normal 0.8(1000), 0.2(1000)% 10 approximately normal srs it is reasonable to assume the total number of cards is over 10,000 it is reasonable to assume the total number of cards is over 1000