The incubation time for a breed of chicks is normally distributed with a mean of20days and standard deviation of approximately3days. Look at the figure below and answer the following questions. If856eggs are being incubated, how many chicks do we expect will hatch in the following time periods? Round your answers to whole numbers. (Note: In this problem, let us agree to think of a single day or a succession of days as a continuous interval of time. Assume all eggs eventually hatch.)

(a) in11to29days chicks (b) in20days or more chicks

(c) in 17 to 23 days chicks (d) in 14 to 26 days chicks