Author Question: The number of first-year students who will decide to live in dormitories is a binomial random ... (Read 36 times)

TFauchery · **on:** Jul 24, 2018

The number of first-year students who will decide to live in dormitories is a binomial random variable X with n = 1000 and p = 0.50 . Use the normal approximation with continuity correction to approximate the probability that X will be no more than 490, P(X 490).
a. 0.2743
b. 0.2709
c. 0.7291
d. 0.7357

Question 2

A random sample of 250 third graders scored an average of 3.2 on a standardized reading test. The standard deviation was 0.95 . What is the standard error of the sample mean?
a. 0.95
b. 0.202
c. 0.0038
d. 0.060