SOLUTION: I am extremely confused with how to answer this question....wouldn't I need to know the sample size in order to determine the age of everyone in the class? Someone please help me..

Algebra ->  Probability-and-statistics -> SOLUTION: I am extremely confused with how to answer this question....wouldn't I need to know the sample size in order to determine the age of everyone in the class? Someone please help me..      Log On


   

Question 417379: I am extremely confused with how to answer this question....wouldn't I need to know the sample size in order to determine the age of everyone in the class? Someone please help me...
Question:
If the mean age of students in a class is 19, how many students do I have to ask their age before determining the age of everyone in the class?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

you have to ask age of at least 18 students...
you can find age of 19th = mean*19 -( sum of age of 18 students)

then u can find the age of all the students.