Flight times for certain airline are normally distributed with a mean of 3.25 hours and a standard deviation of 0.15 hours. Approximately what percentage of the flights last between 2.95 and 3.55 hours?

What is the value of 1/3x + 7x when x = 5

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders