a) 
because it is equal to the area of the shaded region between X=4 and X=6, and the probability that X falls within some interval is given by the area under the PDF.
b) 
because the shaded region is a rectangle of height 1/5 (by virtue of X following a uniform distribution over the interval [2, 7], which has length 5).
6 balls in the bag
1/6 getting the random color
1/6=about .16
so C
Answer:
20, 35, 50
Step-by-step explanation:
$1,500,000 is the total revenue
