The probability that X can take the values x, has the following form, where
k is some unknown constant P(X = x) =
0 1, if
0
, if
1or2
(5
), if
3or4
0, otherwise
=
⎪⎧
=
⎪⎨
−
=
⎪
⎪⎩
x
kx
x
k
x
x
(a)
Find the value of k (b)
What is the probability that you study at least two hours