The time it takes to fly from Paris to London is normally distributed. If the mean flight time is 80 minutes with a standard deviation of 3.8 minutes, what is the probability that the next flight from Paris to London will take under 72.4 minutes? A.13.60%
B.4.56%
C. .15
D 2.28

First locate the turning point (vertex) of the graph. which is at the coordinates x=5 and y=9 or (5; 9).to determine whether it's a maximum or mininum value, you have to discern whether the vertex's y-value is the highest value or lowest value the graph can reach. since the vertex's y-value, 9 is the highest value the graph can reach, it will be a maximum.another basic way to determine whether the vertex's value is max or min is to see if the graph is smiling or sad. if it's smiling, the turning point/vertex would be a minimum, while a sad parabola would have a maximum y-value at the vertex.