Consider .. X = {1, 2, 3, 4}, x = 4 .. Y = {2, 3, 4, 5, 6}, y = 5, w = 3 The elements in X or Y (X ∪ Y) are {1, 2, 3, 4, 5, 6}, n = 6. .. n = 6 = 4 + 5 - 3
Note that if we just add x and y, we count the common elements twice. In order to just count the common elements once, we need to subtract that count from the total of x and y.
Starting with the point (-1, 4) and the slope m = -3, write out the point-slope equation of a straight line: y - k = m(x - h) becomes y - 4 = -3(x + 1), or:
y = -3x - 3 + 4
y = -3x + 1 This is the same as answer choice (b).
The measure of center that best represents the data is median because the data is ordinal, that is it is in ranks. The first is 21, the second is 34, third is 56, fourth is 57 and fifth is 58.
