Finding the change in mean after replacing a value
Finding the change in mean after replacing a value.
- Mean = total of values ÷ number of values.
- Mean × count recovers a total. Combine totals before dividing by a combined count.
- Keep exact values until the final rounding step.
Example 1
A data set has 10 values. A value of 3 is corrected to 7. How does the mean change?
Example 2
A data set has 11 values. A value of 4 is corrected to 8. How does the mean change?
Your turn
A data set has 12 values. A value of 5 is corrected to 9. How does the mean change?
Check answer
A data set has 13 values. A value of 6 is corrected to 10. How does the mean change?
Check answer
A data set has 14 values. A value of 7 is corrected to 11. How does the mean change?
Check answer
A data set has 15 values. A value of 8 is corrected to 12. How does the mean change?
Check answer
A data set has 16 values. A value of 9 is corrected to 13. How does the mean change?
Check answer
A data set has 12 values. A value of 5 is corrected to 9. How does the mean change?
AnswerA data set has 13 values. A value of 6 is corrected to 10. How does the mean change?
AnswerA data set has 14 values. A value of 7 is corrected to 11. How does the mean change?
AnswerA data set has 15 values. A value of 8 is corrected to 12. How does the mean change?
AnswerA data set has 16 values. A value of 9 is corrected to 13. How does the mean change?
Answer