One disadvantage of the range is that a) only extreme values are used in its calculation.
b) it is expressed in different units than the mean.
c) it does not exist for some data sets.
d) it is undefined if any X values are 0 or negative.

a) only extreme values are used in its calculation.

Step-by-step explanation:

In a data set, the range is given by the subtraction of it's highest value by it's lowest value.

The disadvantage is that it gives a high weight to extreme values, not focusing on central values. So the correct answer is given by option a

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step-by-step explanation: