The class mean score on a test was 40, and the standard deviation was 15. If Jack's score was within 2 standard deviations of the mean, what is the lowest score he could have received? Choose the correct choice from the following options
A) 20
B) 31
C) 45
D) 90
E) 89
1 SD from the mean is ADDING and Subtrating the amount if standard deviation from the mean one time. 2 SD from the mean is ADDING and Subtracting TWICE.   1SD from the mean ranges from 25 to 55, where 55 is within SD above the mean and 25 within 1SD below the mean   2SD=15 TWICE=30 from the the mean, which is 55 to 25, where 55 is within 2 SD above the mean AND 30 is within 2 SD below the mean.   20nswer = 20
<result>A</result>
The class mean score on a test was 40, and the standard deviation was 15. If Jack's score was within 2 standard deviations of the mean, what is the lowest score he could have received?