A normal distribution of data has a mean of 15 and a standard deviation of 4. How many standard deviations from the mean is 252
0 0.16
0.4
0 2.5
O 6.25

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.