Question

Let X be the random variable whose probability mass function is the following: f(x) = ( c/3 x , if x = 1, 2, 3, . . . 0, otherwise Find P(3 ≤ X < 7)

Answer 1

The answer of P(3 ≤ X < 7) is 0.367

Explanation:

Note that £fx= 1 in a probability mass function the sum of the function is equal to 1.

See attached picture for solution.