If the age distribution of customers at a major retail chain is ...

[sc00by25]

If the age distribution of customers at a major retail chain is thought to be bell-shaped with a mean equal to 43 years and a standard deviation equal to 7 years, the percentage of customers between the ages of 29 and 57 years is:
 
  A) approximately 81.5.
  B) approximately 68.
  C) at least 75.
  D) approximately 95.

Question 2

What is a slack? Explain with an example.
 
  What will be an ideal response?

[Sassygurl126]

Answer to Question 1

D

Answer to Question 2

The slack is the difference between the right- and left-hand sides of a constraint.
For example, consider the following constraint:
7x + 8y  168
If the optimal values of x and y are 5.25 and 10.5 respectively, the slack can be calculated as:
168 - (7  5.25 + 8  10.5 ) = 47.25