Posted by Denise on .
Suppose we have a set of blood pressures with a mean of 120 Systolic, and a sample standard deviation of 20 points. If we assume a normal distribution of Systolic blood pressures, then between what two values can we be assured 99.7% of all Systolic blood pressures will lie?

Statistics 
PsyDAG,
99.7% = Mean ± 3 SD