What is the average number of books read by a group of 20 students, given that each student read 5, 8, 6, 10, 7, 9, 5, 4, 8, 7, 6, 9, 7, 6, 5, 7, 6, 8, 9, and 4 books, respectively?
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What is the value of f(x) if f(x) = c, given that c is a constant value?
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Find the absolute extrema of the function f(x) = x^2 - 3x + 4 on the interval [0, 5].