#1 The approximate mean age is

HOW MANY YEARS?

Age Frequency

0-9 32

10-19 29

20-29 19

30-39 23

40-49 15

50-59 53

60-69 34

70-79 12

80-89 6

#2 For the month ofApril, a checking account has a balance of $571 for 23 days, $2316 for 2 days, and $268 for 5 days. What is theaccount's mean daily balance forApril?

#3 The data represent thetime, inminutes, spent reading a political blog in a day. Construct a frequency distribution using 5 classes. In thetable, include themidpoints, relativefrequencies, and cumulative frequencies. Which class has the greatest frequency and which has the leastfrequency?

15

13

25

10

15

29

16

21

6

16

5

28

24

19

6

5

2

10

0

18

#4 USING THE DATA BELOW ANSWER THE FOLLOWING QUESTIONS

DATA SET: Triglyceride levels (in milligrams per deciliter of blood) of 28 patients

209 140 155 170 265 138 180

295 250 320 270 225 215 390

420 462 150 200 400 295 240

200 190 145 160 175 195 223

Part A)Show your work to calculate the class width for this distribution using 10 classes.

Part B)Assume that you were asked to use a class width of 32,find the lower and upper class limits for a frequency distribution using 10 classes.

Part C)Assume that you were asked to use a class width of 33,find the lower and upper class limits for a frequency distribution using 10 classes.

Part D)Use the results from parts b and c to explain why, for all sets of data, it is necessary toround the class width UP no matter what, to the nearest whole number.

#5 This exercise gives you the opportunity to show that you can calculate the variance and standard deviation for data sets both "by hand" and using technology. You will be expected make these calculations throughout this course.

Use this sample data set to answer parts a, b:

High temperature in Omaha on January 1 in eight recent years:

38, 34, 38, 11, 22, 41, 19, 39

Part A)State the "Type of data" AND "Level of Measurement". Justify your answer.

Part B)Find the variance and standard deviation for the data "by hand" using the formula. Do not round the mean. Create a tablesimilar to show the deviations and the squares of the deviations. Show all necessary steps in the process.