If the number of quantities in group A is 10 and in group B is 8, and their individual average is 24 and 16 respectively, find the combined average of the two groups.
Answer & explanation
Correct answer: option 2
Total quantities in group A - 10 Χ 24 = 240
Total quantities in group B - 8 Χ 16 = 128
Combined average of 2 groups - \(\frac{\text{240 + 128}}{\text{10 + 8}}\)
Combined average of 2 groups - \(\frac{\text{368}}{\text{18}}\)
Combined average of 2 groups - 20.44