An article in the Journal of Aircraft (1988) describes the computation of drag c

Question

An article in the Journal of Aircraft (1988) describes the computation of drag coefficients for the NASA 0012 airfoil. Different computational algorithms were used at M_infinite = 0.7 with the following results (drag coefficients are in units of drag counts; that is, one count is equivalent to a drag coefficient of 0.0001): 79, 97, 70, 83, 81, 85, 82, 80, and 84. Compute the sample mean, sample variance, and sample standard deviation. Round your answers to 2 decimal places. The sample mean is drag counts. The sample variance is (drag counts)^2. The sample standard deviation is drag counts.

Explanation / Answer

Mean = ( 79 + 97 + 70 + 83 + 81 + 85 + 82 + 80 + 84 ) / 9 = 82.333

variance = ( (79-82.33)2 + (97-83.33)2 + (70-83.33)2 + (83-83.33)2 + (81-83.33)2 + (85-83.33)2 + (82-83.33)2 + (80-83.33)2 + (84-83.33)2 ) / 9 = 44

Standard deviation = 6.633

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