Question

What is the probability of X=4?
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Answer 1

0.30

Explanation:

sum of all probabilities is 1

so:

p(x=4) = 1 - ( 0.01 + 0.04 + 0.10 + 0.12 + 0.30 + 0.11 + 0.01 +0.01)

= 1 - 0.70

= 0.30