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The GPAs (grade point averages) of students who take the AP Statistics exam are approximately normally distributed with a mean of 3.4 and a standard deviation of 0.3. What is the probability that a student selected at random from this group has a GPA lower than 3.0? 
Overseas Competition->Knowledge Point->Calculation Modules
P(X\textless3.0) = $P(z\textless\frac{3-3.4}{0.3}=-1.33)$ = 0.0918  or  normalcdf(-100, 3, 3.4, 0.3) = 0.0912 