The mean age of 5 boys is equal to 9.8. Furthermore, the mean age of 15 girls is 10.2. The mean age of the 20 children together is equal to?
+37146 Mean is the average
b / 5 = 9.8 b = 49 years total
g/15 = 10.2 g = 153 years total
(49+153) / 20 = 10.1 mean
