The time spent by customers on a website follows a normal di…

The time spent by customers on a website follows a normal distribution with a mean of 18 minutes and a standard deviation of 2 minutes. What is the probability that a customer’s time spent on the website will be between 13 minutes and 20 minutes? Provide the correct numerical answer as a decimal, rounded to three decimal places.

The processing time for a batch of products in a factory fol…

The processing time for a batch of products in a factory follows a normal distribution with a mean of 30 minutes and a standard deviation of 5 minutes. What is the probability that the processing time will be between 26 minutes and 38 minutes? Select the correct Excel function statements to calculate this probability.

The number of sunny days in a year in a certain region follo…

The number of sunny days in a year in a certain region follows a normal distribution with a mean of 120 days and a standard deviation of 25 days. A climatologist wants to figure out what a likely range of outcomes is for the number of sunny days. What is the upper bound to an interval in which the number of sunny days will fall 80% of the time? Provide your answer rounded to the nearest whole number.