Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.62 2.62
and a standard deviation of 0.4
0.4
. Using the empirical rule, what percentage of the students have grade point averages that are no more than 3.82
3.82
? Please do not round your answer.

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth