The z-score is calculated by subtracting the mean from the value and dividing by the standard deviation.
For 113 days, the z-score is:
\[ Z_1 = \frac{113 - 114}{0.75} = -1.33 \]
For 115 days, the z-score is:
\[ Z_2 = \frac{115 - 114}{0.75} = 1.33 \]
Show more…