the arithmetic mean of a set of 20 test scores is represented by x. If each scores is increased by y points, which expression represents the arithmetic mean of the revised set of test scores?

In a set of n date values, m represents the median. If each number in the set is decreased by 3, which expression represents the median of the revised set of data values?

The lowest value in a set of ordered scores is x and the highest value is y. If each score is increased by k, then which of the following must be true of the revised set of scores? I. The mean is increased by k. II. The range is k. III.The median remains unchanged.

The arithmetic mean of a set of 40 values is 65. If the 40 values is increased by 5, then the mean of the new set of values is

The arithmetic mean of a set of observations is bar(X) . If each observation is divided by alpha and then is increased by 10, then the mean of the new series is

The arithmetic mean of a set of observations is bar(X) . If each observation is divided by alpha and then is increased by 10, then the mean of the new series is

In order to compensate for a diffecult midterm exam. Danialle's mathematics teacher adjusted each of the 25 students' midterm exam scores by replacing it by one half of the original score increased by 50. If the mean of the revised set of midterm scores is 82, what was the mean of the original set of scores?

The arithmetic mean of a set of 10 numbers is 20. If each number is first multiplied by 2 and then increased by 5, then what is the mean of new numbers ?