You are examining a group of 4 stock analysts within an industry. The average stock analyst correctly predicts the direction of a given stock 51% of the time. For these analysts, their accuracy has been 40%, 50%, 60%, and 70%. What is the mean absolute deviation of their accuracy from the average?
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A. B. C. D.B
The mean absolute deviation = the sum of (as i goes from 1 to n) of the absolute value of (X_i - Xbar), divided by n. Here, we have [|40% - 51%| + |50% - 51%| + |
60% - 51%| + |70% - 51%|]/4 = [11% + 1% + 9% + 19%] / 4 = 40%/4 = 10%.