We know that
• The mean is 0.
,
• The standard deviation is 1.00.
The cutoff value at +2.7% is found by adding the standard deviation three times to the mean.
The cutoff value at -2.7% is found by subtracting the standard deviation three times with the mean.
[tex]\begin{gathered} 0+3\cdot1.00=3.00 \\ 0-3\cdot1.00=-3.00 \end{gathered}[/tex]
Therefore, the cutoff values are -3 degrees and 3 degrees, approximately.
