From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900 . The standard error of the mean is approximately _____.
a. 1.1022
b. 2
c. 30
d. 1.4847
Question 2
A local university reports that 3 of its students take their general education courses on a pass/fail basis. Assume that 50 students are registered for a general education course.
a. Define the random variable in words for this experiment.
b. What is the expected number of students who have registered on a pass/fail basis?
c. What is the probability that exactly 5 are registered on a pass/fail basis?
d. What is the probability that more than 3 are registered on a pass/fail basis?
e. What is the probability that less than 4 are registered on a pass/fail basis?
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