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➷ (18.2 x 2) + 153.1 = 189.5 (this is considered the highest value)
153.1 - (18.2 x 2) = 116.7 (this is considered the lowest value
An unusual value would be more than 2 standard deviations away from the mean in a positive or negative direction.
In this case, the value is less than the highest value.
The value of 187 would be considered usual as it is less than 2 standard deviations away from the mean.
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