SOLUTION: Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 85 and a standard deviation of 5. What is the relative frequency of rates less th

Algebra ->  Probability-and-statistics -> SOLUTION: Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 85 and a standard deviation of 5. What is the relative frequency of rates less th      Log On


   

Question 1191998: Assume the resting heart rates for a sample of individuals are normally distributed with a mean of 85 and a standard deviation of 5. What is the relative frequency of rates less than 95 using the 68-95-99.7 rule?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=(x-mean)/sd
so it is z<+2
the rule above says that 2.5 % are above 2sd (and 2.5 below 2sd).
The answer then is 97.5%.