The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips.

The speed of cars  on a specific road is normally distributed with a mean of 54 mph and a standard deviation of 3. The top 2.5% of cars are traveling at at least what mph?

The distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes.   How many minutes wait time represents the 80th percentile?

Steel rods are manufactured with a mean length of 25 centimeters. Because of variability in the manufacturing process, the lengths of the rods are approximately normally distributed with a standard deviation of 0.08cm. Any rods that are shorter than 24.81cm or longer than 25.19cm are discarded. What proportion of the rods will be discarded?

According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a standard deviation of 1.5 hours. These hours are normally distributed.  c. Find the proportion of men who sleep between 6-8 hours per night.  d. Find the number of hours that represents the 90th percentile.

Butt-to-knee length is approximately normally distributed with a mean of 23.1 inches and a standard deviation of 1.2.  Theater seats are designed to be comfortable for as many adults as possible.  If the seats are required to fit the middle 80% of the population, the seat must be comfortable for what butt-to-knee length range?

Suppose the mean number of candies in a standard vending machine bag is 47.6 with a standard deviation of 1.3 . assume that the number of candies is normally distributed what percentage of bags have less than 45 candies?

The gas mileage for a new model of car is normally​ distributed, with a standard deviation of 3.5 miles per gallon. If only​ 4% of the cars have a gas mileage of above 20​ mpg, what is the mean of the​ distribution

A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose a random sample of 1077 people with mean amount of time spent eating and drinking per day is 1.09 hours with standard deviation of 0.52 hours, 95 percent confident rate

A particular fruit's weights are normally distributed, with a mean of 790 grams and a standard deviation of 26 grams.The heaviest 6% of fruits weigh more than how many grams?