The scores of students on the SAT college entrance examinati

The scores of students on the SAT college entrance examinations at a certain high school had a normal distribution with mean ?=539.9 and standard deviation ?=28.5 .

(a) What is the probability that a single student randomly chosen from all those taking the test scores 546 or higher?
ANSWER:__________

(d) What is the probability that the mean score x

Solution

a) z = (546 - 539.9 ) / 28.5 = 6.1/28.5 = 0.21

P(z>0.21) = 0.5832 Answer

b) It will be again : 0.5832 Answer