Find the new mean after adding a value
Find the old total, add the new number, and divide by the new count.
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The mean of 4 numbers is 10. A new number, 5, is added. What is the mean of all 5 numbers?
Answer: 9
The mean of 4 numbers is 7. A new number, 2, is added. What is the mean of all 5 numbers?
Answer: 6
The mean of 4 numbers is 4. A new number, 19, is added. What is the mean of all 5 numbers?
Answer: 7
Tip: Find the old total, add the new number, and divide by the new count.
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