Answered

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x is a discreate random variable:
(a) Verify that the following function is a cumulative distribution function:
{[0, x < - 20],
(x) = [0.2, - 20 ≤ x < 10],
[0.5, 10 ≤ x < 40]
[1, 40 ≤ x]}

Sagot :

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