Question 973725
You're off to a good start. You have found that if x = 163, then z = -1. Also, if x = 177, then z = +1


The empirical rule states that roughly 68% (shown in <font color="blue">blue</font>) of the popluation is between z = -1 and z = +1


<img src = "http://www.nku.edu/~statistics/images/Using_1.gif">
Source: <a href="http://www.nku.edu/~statistics/212_Using_the_Empirical_Rule.htm">http://www.nku.edu/~statistics/212_Using_the_Empirical_Rule.htm</a>



So the answer to the blank in part A is 68

---------------------------------------------------------------------------


You also found that if x = 149, then z = -3. If x = 191, then z = +3


Use the same drawing above, but now focus on the 99.7% portion in <font color="red">red</font>. That says 99.7% of the population is within 3 standard deviations of the mean


So the answer to the blank in part A is 99.7