Option C is correct, a value of 18 is 1.5 standard deviations away from the mean.
What do you mean by standard deviation?
In statistics, Standard deviation is a measure of the variation of a set of values.
The mean is given as 12 and the data has a standard deviation of 4
See how far away 18 is from 12 using 4
12 + 4 = 16
16 is one deviation
16 + 4 = 20
20 is two deviation
18 is right in the middle
The answer is C which is 1.5 deviations.
Therefore, A value of 18 is 1.5 standard deviations away from the mean.
Learn more about standard deviation;
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