What is the probability that the fifth adult selected will


Question - According to the Anxiety and Depression Association of America (ADAA), approximately 4% of all adults have attention-deficit/hyperactive disorder (ADHD).30 An experiment consists of selecting adults at random and asking them if they have ADHD

a. What is the probability that the fifth adult selected will be the first with ADHD?

b. What is the probability that at least eight adults will be selected before identifying a person with ADHD?

c. What is the mean number of adults that must be selected before identifying a person with ADHD?

d. Suppose the 35th adult is the first with ADHD. Is there any evidence to suggest the ADAA claim is false? Justify your answer.

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