- Suppose \( X \) is normal with mean 8.0 and standard deviation 5.0 - Find \( P(X<8.6) \)

Step 1 ：\(Z = \frac{X - \mu}{\sigma}\)

Step 2 ：\(Z = \frac{8.6 - 8.0}{5.0}\)

Step 3 ：\(P(X<8.6) = P(Z<0.12)\)