Question 28
Measures of Central TendencyThe average age of a group 25 girls is 10 years. If one girl, aged 12 years and 4 months joins the group, find, correct to one decimal place, the new average age of the group.
- A.10.1 years
- B.9.3 years
- C.8.7 years
- D.8.3 years
Show the answer and explanation
Answer: A (10.1 years)
Explanation
Total age = 250 + 12⅓ = 262⅓ years for 26 girls; 262⅓ ÷ 26 ≈ 10.1 years.