1 Suppose X ~ N(25, 4). What is the z-score of x = 21?

2 Use the Empirical Rule to find what percent ofxvalues lie between the first and third standard deviations (both sides) on a normal distribution?

3 SupposeX~N(100, 15). Using the Empirical Rule, between whatxvalues does approx. 95% of the data lie?