Question 1124939
Range Rule of Thumb - The standard deviation will be range/4.  In other words, the range will be 4 * SD.

Significantly low is below the "usual" range, while sig high is above the "usual" range.  The "usual" range is 2 SD above and 2 SD below the mean.


The "usual" range for this situation is 77.4 - 2(11.5) to 77.4 + 2 (11.5) = 54.4 to 100.4.  

Significantly low will be less than 54.4.

Sig high will be greater than 100.4.

140.4 is significantly high.