Answer:
A, C, E for the first one; B, C, E for the second one; B and E for the last one
Step-by-step explanation:
Answer: u=7
-6= -2u+4(u-5)
-6= -2u+4u-20
-6= 2u-20
14= 2u
7=u
a) c = 1/15
b) =2/5
c) = 3/5
d) No, it cannot be the PMF of y.
We have that
the solution is in the above picture.