The values 4, 6, 8 and 10 have a mean of 7, and a fifth value of 7 is then added to the set. Which statements about the new set of five values are true? Select all that apply.

توضیح

The original four values total 28, so adding a fifth value of 7 makes the total 35, and 35 divided by 5 values gives 7 once more. An extra observation only moves a mean when it differs from the current mean, so a value that already equals 7 leaves the balance point exactly where it was.