What is the arithmetic mean of the following data set with frequency in paranthesis?
20 (3), 32 (4), 47 (2), 10 (3)
18
26
32.5
36
40.5
(20 x 3 + 32 x 4 + 47 x 2 + 10 x 3) / 12 = 312 / 12 = 26. pg. 87. Correct answer is B.
