what is the mean of all three-digit positive integers in the set {2, 0, 1, 9}
+4622 Count how many three digit numbers you can form, then add all of them up, and divide by how the number of numbers.
+776 Um...I don't see any three digit numbers in the set {2, 0, 1, 9}. I only see single-digit numbers.
+776 mean is the same thing as average. Add up all terms, and divide by the number of terms.
if there 3 terms of x, y, and z, the mean or average is \(\dfrac{x+y+z}{3}\).
