Preventing fatigue crack propagation in aircraft structures is an important element of aircraft safety. An engineering study to investigate fatigue crack in n equals 9 cyclically loaded wing boxes reported the following crack lengths (in mm): 2.09, 2.96, 3.04, 1.80, 1.20, 1.36, 2.02, 2.51, 2.57. Calculate the sample mean and sample standard deviation. Round your answers to 4 decimal places.

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet