For a distribution with mean = 50 and standard deviation = 5, find the raw scores for the following z- scores:
- 1.2; -0.5; 1.7; 2.6
44.00; 47.50; 58.50; 63.00
20.00; 37.50; 92.50; 115.00
47.32; 48.88: 53.80; 55.81
0 -20.00; -37.50; 92.50; 115.00

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

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