A discrete random variable
X
X can take the values 1,2,···,7. For these values the cumulative distribution function is defined by:
F
(
x
)
=
P
(
X
≤
x
)
=
x
2
+
k
95
F(x)=P(X≤x)=
95
x
2
+k
;
x
x= 1,2,···,7. Find the value of
k
k.
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