Test Your Skills
A) Experience has shown that 1/200 of all CDs produced by a certain machine are defective. If a quality control technician randomly tests twenty CDs, compute each of the following probabilities:
• P(exactly one is defective)
• P(half are defective)
• P( no more than two are defective)
B) After studying a couple’s family history, a doctor determines that the probability of any child born to this couple having a gene for disease X is 1 out of 4. If the couple has three children, what is the probability that exactly two of the children have the gene for disease X?
| Answers | ||||
|---|---|---|---|---|
| (A) 14/45 | ||||
| (a) .024 | (b) .336 | (c) .664 | ||