a) Screen Time Americans spend an average of 7 hours a day looking at a screen. Assume the variable is approximately normally distributed and the standard deviation is 1.6 hours. Find the time limits for the middle 52% of screen viewers. Use a TI-83 Plus/TI-84 Plus calculator and round the answers to at least two decimal places.

The limits for the middle 52% of screen use by Americans are ? and ? hours.

b)Eyeball Measurement The average width of a human eyeball is normally distributed with a mean of 22.822 mm and a standard deviation of 1.7mm.

What is the probability that the width of a person's eyeball is less than 25mm ?Use a TI-83 Plus/TI-84 Plus calculator. Round the answer to at least four decimal places.