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Ellen is taking 4 courses for the semester.She believes that the probability distribution function for the number of courses in which she will get an
Ellen is taking 4 courses for the semester.She believes that the probability distribution function for the number of courses in which she will get an A grade is given below.
X 0 1 2 3 4 P(X) 0.10 0.50 0.20 0.15 0.05
a) (2 pts) What is the random variable in this problem? Describe it.
b) (3 pts) What is the probability that Ellen will get at least 2 A's?
c) (3 pts) Find the mean and standard deviation the probability distribution.
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