a. The marginal densities

and

b. This can be obtained by integrating the joint density over [0.25, 1] x [0.5, 1]:

Answer:
A
Step-by-step explanation:
I guessed also I just took the exam
Answer:
-6.25 tI am not sure if this can help you but this is what I got
Answer:
2nd one
Step-by-step explanation:
1/5 = 20% so... 2/5 = 40%
40% of 7.6 is 3.04
Subtract 3.04 from 7.6, you get 4.56
The farmer sells 4.56 kilograms of pears at the Farmers Market.