e time taken to complete an exam folows a normal probability distribution with a mean of 60 minutes and standard deviation of 10 minutes. What is the probability that a randomly chosen student will complete the exam in 50 minutes or long

O > At a certain restaurant in Ohio, the number of minutes that diners spend at the table has a major impact on the profitability of the restaurant. Suppose the average number of minutes that diners spend at a table for dinner at the restaurant is 95 minutes with a standard deviation of 17 minutes. Assume the number of minutes diners spend at their table follows the normal probability distribution. Complete parts a through d. a. Calculate the probability that the average number of minutes that diners spend at their table for dinner will be less than 90 minutes using a sample size of 9 tables. (Round to three decimal places as needed.) b. Calculate the probability that the average number of minutes that diners spend at their table for dinner will be less than 90 minutes using a sample size of 20 tables. (Round to three decimal places as needed.) c. Calculate the probability that the average number of minutes that diners spend at their table for dinner will be less than 90 minutes using…

The time it takes for a statistics professor to mark a single midterm test is normally distributed with a mean of 4.7 minutes and a standard deviation of 1.7 minutes. There are 56 students in the professor's class. What is the probability that he needs more than 5 hours to mark all of the midterm tests?Probability =

The life of a vacuum cleaner is normally disyributed with mean 5 years and standard deviation 2 year. find the probability that it lasts less than 4 years.

The manufacturer of cans of salmon that are supposed to have a net weight of 6 ounces tells you that the net weight is actually a normal random variable with a mean of 5.95 ounces and a standard deviation of 0.14 ounce. Suppose that you draw a random sample of 32 cans. Find the probability that the mean weight of the sample is less than 5.9 ounces. Probability = xxxxxxxxxxxx

The lengths of human pregnancies are approximately normally distributed with a mean of 268 days and a standard deviation of 16 days. What is the probability that pregnancy lasts between 240 and 280 days?

In a Normal distribution, the average is 45 and standard deviation is 12. What is the probability that the outcome is MORE than 40?

The amount of sleep per night for students in Nursing is normally distributed with mean 7.5 hours and standard deviation 0.8 hours. Use the probability tables to determine what percent of nursing students get between 7 and 9 hours of sleep per night.

The amount of time it takes students to complete a biology exam is normally distributed with a population mean of 120 minutes and standard deviation of 30 minutes. What is the probability that 25 randomly selected students will take longer than 135 minutes?

Suppose that the average number of hurricanes is 32 per year with a standard deviation of 2.8 and follow a normal distribution. What is the probability that we will have more than 31 hurricanes this year in a decimal form?