7. The serum cholesterol levels in Alaska females aged 18 to 21 are normally distributed with a mean of ...

  

7. The  serum  cholesterol  levels  in  Alaska  females  aged  18  to  21 are  normally distributed with a mean of 138.7 and a standard deviation of 20.5.  All units are in mg/100mL,  and  the  data  are  based  on  the  National  Heath  Survey  (USDHEW publication  78-1654).  If a  woman  aged 18 to 25 is  randomly  selected,  find  the probability  that her serum cholesterol is between 155.0 and 165.0.

(4 points)

8. Assume that  the average IQ of college graduates is 110 with a standard deviation of24.  Determine the "z" values for the following student IQ scores.  (3 points)

a.156 b.98 c.ll