What value must be added to 15 and 20 to keep the mean of the new set as 20?

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Q1.

What is the mean of the numbers 4, 8, and 12?

Q2.

Which of the following represents a characteristic of the mean?

Q3.

If the mean of the data set {5, 10, 15, 20} is 12.5, which statement is true?

Q4.

What happens to the mean if a new number much larger than the current mean is added?