Data are drawn from a bell-shaped distribution with a mean of 130 and a standard deviation of 5.
a. Approximately what percentage of the observations fall between 115 and 145? (Round your answer to the nearest whole percent.)
b. Approximately what percentage of the observations fall between 120 and 140? (Round your answer to the nearest whole percent.)
c. Approximately what percentage of the observations are less than 120? (Round your answer to 1 decimal place.)