Assume the distribution of times that a swimmer can hold their breath is normally distributed. A random sample of 4 people timed how long they could hold their breath. The results were: 3 seconds
87 seconds
109.4 seconds
120.6 seconds

Required:
Find a 83% confidence interval for the average amount of time a person can hold their breath.

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin