1. Let x be the number of courses for which a randomly selected student at a certain university is registered. The probability distribution of x appears in the table shown below:

x 1 2 3 4 5 6 7

p(x) .04 .02 .08 .26 .35 .14 .11

(a) What is P(x = 4)?

P(x = 4) =

(b) What is P(x 4)?

P(x 4) =

(c) What is the probability that the selected student is taking at most five courses?

P (at most 5 courses) =

(d) What is the probability that the selected student is taking at least five courses? more than five courses?

P (at least 5 courses) =

P (more than 5 courses) =

(e) Calculate P (3 x 6) and P(3 < x < 6).

P (3 x 6) =

P (3 < x [removed] μx) =

10. In a probability model, which of the following numbers could be the probability of an outcome? (Select all that apply.)

2/3

1/4

-1/4

1.4

0

3/4