Question

The incubation time for a breed of chicks is normally distributed with a mean of 24 days and standard deviation of approximately 1 day. Look at the figure below and answer the following questions. If 1000 eggs are being incubated, how many chicks do we expect will hatch in the following time periods? (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.) Area Under a Normal Curve 2.35% 13.5% 34% 34% 13.5% 2.35% H- 30 H - 20 uto u + 20 1+ 30 68% 95% 99.7% (a) in 22 to 26 days chicks (b) in 23 to 25 days chicks (c) in 24 days or fewer chicks (d) in 21 to 27 days chicks