Question

the following table displays a frequency distribution for the number of crew members on each shuttle mission over a 10 - year period. let x denote the crew size on a randomly selected shuttle from this time period.
crew size: 3, 4, 5, 6, 7
frequency: 4, 7, 38, 22, 7
3,4,5,6,7 (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 5
{x = 6}
c. find p(x = 4).
p(x = 4)= (round to three decimal places as needed.)

Explanation:

Step1: Calculate total frequency

Total frequency = 4 + 7+38 + 22+7 = 78

Step2: Calculate P(X = 4)

The frequency of X = 4 is 7. So $P(X = 4)=\frac{7}{78}\approx0.090$

Answer:

0.090