(Q3-Q4) Go to this link to see the z-table. http://www.z-table.com/

3. If the average age of retirement for the entire population in a country is 65 years and the distribution is normal with a standard deviation of 3.5 years, what is the approximate age range in which 68% of people retire? 4. The waist girth of the 2,500 policemen in a certain region follows the normal distribution with a mean of 36 inches and a standard deviation of 4 inches. a. Approximately, how many policemen have a waist girths less than 32 inches? b. Find the probability that a policeman in the region will have a waist girth between 34 and 45 inches. Sketch the area corresponding probability. c. If policemen whose waist girths belong to the widest 10% will be forced to attend 20 sessions of physical tness classes, nd the minimum girth of those who will be forced to attend physical fitness classes