Asked by mike

A class consists of 9 students with an average age of 40.
When the Instructor arrives the average age of the students and the Instructor is 41.
What is the age of the Instructor?

Answers

Answered by PsyDAG
mean = ∑x/n

41 = [(9*40)+x]/10

Multiply both sides by 10.

410 = 360 + x

Subtract 360.

410 - 360 = x = ?
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