The class mean score on a test was 50, 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
1SD from the mean ranges from 35 to 65, where 65 is within SD above the mean and 35 within 1SD below the mean   2SD=15 TWICE=30 from the the mean, which is 80 to 20, where 80 is within 2 SD above the mean AND 20 is within 2 SD below the mean.   20nswer = 20
<result>A</result>
The class mean score on a test was 50, 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?