According to a recent study, kids aged 12 to 17 watched an average of 3 hours of television per day. Suppose that the standard deviation is 1 hour and that the distribution of the time watching television has a bell-shaped distribution.
What percentage of kids aged 12 to 17 watches television between 2 and 3 hours per day?
What percentage of kids aged 12 to 17 watches television between 1 and 4 hours per day?
What percentage of kids aged 12 to 17 watches television more than 4 hours per day?