1. The number of minutes that it takes an auditor to process an invoice is given in the table below:

42.2

24.6

42.2

9.4

16

33.7

38.8

42.2

42.1

28.7

41.1

31

a. What is the arithmetic mean of processing time? (Round the final answer to 2 decimal places.)

Mean

b. Find the median and mode of the processing times. (Round the final answers to 2 decimal places.)

Median

Mode

c. Is the data symmetrical, positively skewed, or negatively skewed?

Data

2. The Business School at a local college offers eight sections of basic statistics. Following are the number of students enrolled in these sections:

52, 28, 38, 32, 49, 29, 24, and28.

a. Calculate the range.

Range

b. Calculate the arithmetic mean.

Arithmetic mean

c. Calculate the mean deviation. (Round the final answer to 2 decimal places.)

Mean deviation

d. Interpret the range and the mean deviation.

The difference between 24 and 52 is . On the average, the number of students enrolled deviates from the mean of . 3. he annual incomes of the five vice-presidents of TMV Industries are: $144,000; $128,000; $94,000; $146,000; and $141,000. Consider this a population.

a. What is the range?

Range $

b. What is the arithmetic mean income?

Arithmetic mean income $

c. What is the population variance andthe standard deviation? (Round standard deviation to 1 decimal place.)

Population variance $

Standard deviation $

d. The annual incomes of officers of another firm similar to TMV Industries were also studied. The mean was $145,600 and the standard deviation was $19,391. Compare the means and dispersions in the two firms.

Means are about the same but less dispersion in salary for TMV vice presidents. Dispersions are about the same but average incomes of officers of another firm are high. Means are about the same but less dispersion in incomes of officers oi another firm. Dispersions are about the same but average salary for TMU vice presidents are high