SOLUTION: Let's say I know the average height of 30 students is 158cm. And then a new student is added who is 147cm. Can I recalculate the average without knowing each of the previous stude

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Question 145984: Let's say I know the average height of 30 students is 158cm. And then a new student is added who is 147cm. Can I recalculate the average without knowing each of the previous student's height?
Many thanks!
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Let's say I know the average height of 30 students is 158cm. And then a new student is added who is 147cm. Can I recalculate the average without knowing each of the previous student's height?
:
You could do it this way. Assume all 30 students had a height of 158:
%2830%28158%29+%2B+147%29%2F31 = %284740%2B147%29%2F31 = 4887%2F31 = 157.645 cm