How many students must be randomly selected to estimate the mean monthly income of students at a university? Suppose we want 95% confidence that x is within $130 of u, and the o is known to be $520. O A. 44 О В. 520 O c. 0 O D. 61 ОЕ. 7 O F. 107 O G. 130 O H. none of the other answers

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