1. An electronic product takes an average of 5 hours to move through an assembly line. If the standard deviation of 1 hours, what is the probability that an item will take between 2.2 and 4 hours to move through the assembly line? (Round your answer to 4 decimal places.)

2. A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 242.6-cm and a standard deviation of 1.5-cm. Find the probability that the length of a randomly selected steel rod is less than 240.2-cm. P(X < 240.2-cm) =

3. A particular fruit's weights are normally distributed, with a mean of 555 grams and a standard deviation of 32 grams. If you pick 7 fruit at random, what is the probability that their mean weight will be between 522 grams and 558 grams