InterviewSolution
Saved Bookmarks
| 1. |
48.Mean age of 6 boys is 12 years andmean of 9 girls is 10 years. What isthe mean age, in years, of all theseboys and girls taken together ?(A) 10.8 (B) 11(C) 10(D) 10.5 |
|
Answer» Mean = sum of all observations / number of observations Given,Mean age of 6 boys is 12 yrs12 = sum of age of 6 boys/6sum of age of 6 boys = 12*6 = 72 Mean age of 9 girls is 10 yrs10 = sum of age of 9 girls/9sum of age of 9 girls = 10*9 = 90 Now, total sum of age of 6 boys and 9 girls = 72 + 90 = 162 Mean of 6 boys and 9 girls = 162/15 = 10.8 (A) is correct option |
|