Double-checking my answers:

A sample of 20 employees was collected from a manufacturing company and this year's salary data was recorded for these employees. The annual salaries (in thousands of dollars) are listed below.

37 55 34 58 67 41 43 47 48 73 48 57 40 58 66 48 83 78 81 53

3. What is the mode salary?

1. 48

4. The inter-quartile range of the 20 salaries is:

1. $21,500

Not sure on this one and not sure how to equate it .... step would be great

5. Suppose each employee in the company receives a $2,500 raise next year. The inter-quartile range of the salaries for the employees will:

1. be unchanged
2. increase by $2,500
3. increase by $2,500/2 or $1250
4. cannot determine (i.e., not enough information to answer question)