Asked by Ash
The mean of a set of scores is 9.
When a score of 22 is added, the new mean is 10.
How many scores were in the original data?
When a score of 22 is added, the new mean is 10.
How many scores were in the original data?
Answers
Answered by
mathhelper
number of scores initially ---- n
total = 9n
new total = 9n + 22
(9n+22)/(n+1) = 10
"cross-multiply" solve for n
total = 9n
new total = 9n + 22
(9n+22)/(n+1) = 10
"cross-multiply" solve for n