Subject
Quantitative Aptitude
Topic
Average
The average age of a family of 5 members is 25 years. If the age of the youngest member be 9 years. Just before the birth of the youngest member, the average age of the family was: (in years)
The average age of a family of 5 members is 25 years. If the age of the youngest member be 9 years. Just before the birth of the youngest member, the average age of the family was: (in years)
ক)
15খ)
20গ)
21ঘ)
12ঙ)
None of theseExplanation
According to the given information, We know that, Mean = (Sum of all observations)/(Number of observations) Average age of family members = 25 (∑F + 9)/5=25 ∑F + 9 = 125 ∑F = 116 Average age of 4 members 9 years ago = yearsRelated questions
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