A random sample of 17chocolate energy bars of a certain brand​ has, on​ average, 290 calories per​ bar, with a standard deviation of 25 calories. Assume that the distribution of the calorie content is approximately normal. Construct a 90​% confidence interval for σ.

The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.24°F and a standard deviation of 0.67°F. Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of healthy adults with body temperatures within 3 standard deviations of the mean, or between 96.23°F and 100.25°F? b. What is the approximate percentage of healthy adults with body temperatures between 97.57°F and 98.91°F?

The body temperatures of a group of healthy adults have a bell-shaped distribution with a mean of 98.34°F and a standard deviation of 0.56°F. Using the empirical rule, find each approximate percentage below. a. What is the approximate percentage of healthy adults with body temperatures within 2 standard deviations of the mean, or between 97.22°F and 99.46°F? b. What is the approximate percentage of healthy adults with body temperatures between 97.78°F and 98.90°F? a. Approximately % of healthy adults in this group have body temperatures within 2 standard deviations of the mean, or between 97.22°F and 99.46°F. (Type an integer or a decimal. Do not round.)

A certain brand of candies have a mean weight of 0.8627 g and a standard deviation of 0.0521. A sample of these candies came from a package containing 457 candies, and the package label stated that the net weight is 390.4 g. (If 390.4 = 0.8543 g for the net contents 457 every package has 457 candies, the mean weight of the candies must exceed to weigh at least 390.4 g.) a. If 1 candy is randomly selected, find the probability that it weighs more than 0.8543 g. The probability is (Round to four decimal places as needed.) b. If 457 candies are randomly selected, find the probability that their mean weight is at least 0.8543 g. The probability that a sample of 457 candies will have a mean of 0.8543 g or greater is (Round to four decimal places as needed.) c. Given these results, does it seem that the candy company is providing consumers with the amount claimed on the label? because the probability of getting a sample mean of 0.8543 g or greater when 457 candies are selected exceptionally…