1- The sum of the deviations from the mean for the set of numbers 4, 9, and 5 will equal zero. True/False?

2-In a company, the standard deviation of the ages of female employees is 6 years and the standard deviation of the ages of male employees is 10 years. These statistics indicate that the dispersion of age is greater for females than for males. Do you agree?

3- If heights of 5th graders follow a normal distribution with a mean of 62 inches and a standard deviation of 3 inches, what is the z score of a 5th grader who is 59 inches tall?

4-What is the nature of correlation between demand and price of a product? Can the coefficient of correlation exceed one?