Originally Posted by

**fara** I'm weak when it comes to solving probability questions that has to do with percentage. please help me.

1. Muscular dystrophy is a genetically controlled disease. The probability of having this disease in any new born of a specific parents is 25%. If the couple has 5 children, find the probabilities that:

(a) 5 will have a muscular dystrophy

(b) Fewer than 2 will have a muscular dystrophy

2. If 20% of the bolts produced by a machine are defective, determine the probability that out of 4 bolts:

(a) 1 is defective

(b) None of the bolts is defective

At most 2 bolts will be defective

tq