Using z-scores, it is found that the unusual values are those that are less than 124.
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The z-score of a measure X in a data-set with mean and standard deviation
is given by:
- The z-score measures how many standard deviations X is from the mean.
- Measures that are<u> more than 2 standard deviations from the mean</u> are unusual.
- Z < -2 means that the measure X is unusually low.
- Z > 2 means that the measure X is unusually high.
In this problem:
- Mean of 150, thus
.
- Standard deviation of 13, thus
.
Unusual values are those that are less than 124.
A similar problem is given at brainly.com/question/15315313
