Posted by Kasi on .
Test scores on the
ACT exam are normally distributed with a mean of 211 and deviation of 4.8.
Using the 689599.7 rule, find the percentage of ACT scores within 9.6 of the mean of 21.1, and 14.4 of the mean of 21.1

statistics 
PsyDAG,
Mean ± 2 SD = 95%
Mean ± 3 SD = 99.7%