Posted by **monea** on Thursday, June 14, 2012 at 3:15pm.

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 .05 .08 .26 .39 .16 .02

(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 < 6) =

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