Suppose a normal distribution has a true population mean of 18 and a true standard deviation of
2. What % of obervations will be:
a.) 18 or less ___
b.) 18 or greater _____
c.) in the range from 16 to 20 ____
Please show work
Solution
a.) 18 or less ___=p(z<0)=50%
b.) 18 or greater _____p(z>0)=50%
c.) in the range from 16 to 20 ____=p(-1