At a customer service call center for a large company, the number of calls received per hour is normally distributed with a mean of 100 calls and a standard deviation of 10 calls. What is the probability that during a given hour of the day there will be less than 88 calls, to the nearest thousandth?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

What is the area of the shaded sector?

Jan accidently ran 7 minutes longer than he was supposed to. write an expression for the total amount of time jan ran if she was supposed to run m minutes