A Sample of 500 Evening Students Revealed That Their Annual

Multiple Choice

A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000. (i) 250 students earned more than $30,000.
(ii. 500 students earned between $20,000 and $40,000.
(iii) 6 students earned less than $22,500.

A) (i) , (ii) , and (iii) are all correct statements
B) (i) is a correct statement but not (ii) or (iii) .
C) (i) and (iii) are correct statements but not (ii) .
D) (i) and (ii) are correct statements but not (iii) .
E) (ii) and (iii) are correct statements but not (i) .