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The following table displays a frequency distribution for the number of crew members on each shuttle mission over a 10-year period. Let

Upper X

X denote the crew size on a randomly selected shuttle from this time period.

Crew size	4 4	5 5	6 6	7 7	8 8
Frequency	3 3	5 5	30 30	24 24	11 11

a. What are the possible values of the random variable

Upper X

X?

nothing

(Use a comma to separate answers as needed.)

b. Use random-variable notation to represent the event that the shuttle mission obtained has a crew size of

7

7.

StartSet nothing EndSet

{

}

c. Find P(X

equals

=

5

5).

P(X

equals

=

5

5)

equals

=

nothing

(Round to three decimal places as needed.)

d. Obtain the probability distribution of

Upper X

X.

Upper X X	4 4	5 5	6 6	7 7	8 8
P( Upper X X)	nothing	nothing	nothing	nothing	nothing

(Round to three decimal places as needed.)