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.

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

How do you find the area of a triangle

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp