Find the mean of 7 numbers if the mean of the first 4 numbers is 5 and the mean of the last 3 numbers is 12. What is the mean of the combined data sets?
Total sum of all the numbers is
4 * 5 = 20 and 3 * 12 = 36
20 + 36 = 56
Total mean is 56/7 = 8
Thanks, brian......welcome aboard......!!!
