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8) [3] According to kidshealth.org, 25% of kids diagnosed with ADHD are affected by anxiety disorders...

8) [3] According to kidshealth.org, 25% of kids diagnosed with ADHD are affected by anxiety disorders (http://kidshealth.org/parent/medical/learning/adhd.html). Show work for full credit.

a) If 7 kids with ADHD are chosen at random, what is the probability three of them would be affected by anxiety disorders?

b) If 7 kids with ADHD are chosen at random, what is the probability that less than three of them would be affected by anxiety disorders?

Math   Statistics-And-Probability   
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Answer #1

a) Probability that 3 of the 7 with ADHD are chosen will have anxiety is computed here as:

Therefore 0.1730 is the required probability here.

b) Probability that less than 3 of the 7 would have anxiety is computed again using binomial probability function as:

Therefore 0.7564 is the required probability here.

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