Stats help Consider the following discrete probability distr

Stats help

Consider the following discrete probability distribution. a. Is this a valid probability distribution? Yes No c. What is the probability that the random variable X is less than 40? (Round your answer to 2 decimal places.) Probability d. What is the probability that the random variable X is between 10 and 30? (Round your answer to 2 decimal places.) Probability e. What is the probability that the random variable X is greater than 20? (Round your answer to 2 decimal places.) Probability

Solution

(a) yes.

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(c)P(X<40)=0.14+0.4+0.26 =0.8

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(d)P(10<X<30)=0.14+0.4 =0.54

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(e)P(X>20) =0.4+0.26+0.2 =0.86