Mary has rehearsed her ballet solo for five and a half hours. a week from now, she wants to have rehearsed at least a total of nineteen and a half hours. if she rehearses for the same amount of time each day for the next 7 days, at least how many hours must she rehearse per day?

A. the probability that a product is defective is 0.1. what is the probability that there will be 1 or less defective products out of the next 8 produced products b.the expected number of imperfections in the coating nylon for parachutes is 6 per 100 yards. what is the probability of finding 12 or fewer imperfections in 260 yards c.in a lot of 54 products there are 9 defective products. calculate the probability that not more than 1 is defective from a random sample of 17 products.