Complete the blanks in the table and answer the following questions.

In the table, calculate the indicated Class Midpoints and Less-than Cumulative Frequencies.

Income brackets for all employees at Some Company (x $1000)

Lower ($ x1000)	Class Limits	Upper ($x1000)	Midpoint (x)	Number of Employees (f)	Less-than Cumulative Frequency
0	x <	10	Answer	4	Answer
10	x <	20	Answer	13	Answer
20	x <	30	Answer	20	Answer
30	x <	40	Answer	18	Answer
40	x <	50		15
50	x <	60		10
60	x <	70		8
70	x <	80		4
80	x <	90		5	Answer
90	x <	100		3	Answer

1) In what format is the above data presented?AnswerFrequency tableFrequency distributionRaw dataGrouped data

2) Does this data represent a sample or a population?AnswerPopulationSampleNeither

3) What is the class width? Answer

4) How many employees work at this company? Answer

5)Using the midpoints to represent the classes, what is the mode?Answer

6)What is the median class?Answer x

(Hint: there are a few relevant formulas towards the end of Ch 3)

7)Calculate the estimated value of the median salaryAnswer

8) Compute thearithmetic mean, using the midpoints to represent the classes Answer

9)What is the standard deviation of the salaries? Answer

10)Is this data positively or negatively skewed or symmetrical?

Positively

Negatively

Symmetrical