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Chapter 3: Q 3.25. (page 101)

Find the

a. Mean b. median c. mode

For the mean and the median, round each answer to one more decimal place than that used for the observations.

Tablet Computers. Tablet personal computers such as iPad and Kindle Fire are one piece portable computers that typically offer a touchscreen. Tablets are available in different sizes but generally offer a screen that is greater than 7 inches diagonally. Consumer Reports reviews tablets of different sizes and Internet capabilities The battery lives, in hours, for a sample of tablets with screen sizes between 9 and 12 inches are provided in the following table.

8.45.610.910.811.58.08.5129

Short Answer

Expert verified

a)9.58hoursb)9.65hours

c) No mode exist

Step by step solution

01

Step 1. Given information. 

We have given data:8.45.6,10.9,10.8,11.5,8.0,8.5,12.9

02

Step 2. Mean of the data. 

Mean =SumofobservationNumberofobservation

=8.4+5.6+10.9+10.8+11.5+8.0+8.5+12.98=76.68=9.58

03

Step 3. Median of the data. 

Arrange the data in increasing order : 15.6,8.8.4,8.5,10.8,10.9,11.5,12.9

Median

==4th+5th2=8.5+10.82=19.32=9.65

04

Step 4. Mode of the data. 

The greatest frequency is the mode of the data set.

There is no mode for the data set.

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Most popular questions from this chapter

Consider these sample data:x1=12,x2=8,x3=9,x4=17

a) Find n.

b) Compute 鈭�xi.

c) Determinex-.

Magazine Ads. Advertising researchers F. Shuptrine and D. McVicker wanted to determine whether there were significant differences in the readability of magazine advertisements. Thirty magazines were classified based on their educational level-high, mid, or low-and then three magazines were randomly selected from each level. From each magazine, six advertisements were randomly chosen and examined for readability. In this particular case, readability was characterized by the numbers of words, sentences, and words of three syllables or more in each ad. The researchers published their findings in the article "Readability Levels of Magazine Ads" (Journal of Adrertiving Reseanch, Vol. 21,No.5,pp.45-51). The number of words of three syllables or more in each ad are provided on the Weissstats site.

Consider the data set: 1,2,3,4,5,6,7,8,9.

a) Obtain the mean and median of the data.

b) Replace the 9in the data set by 99and again compare the mean and median. Decide which measure of the center works better here and explain your answer.

c) For the data set in part b) the mean is neither central nor typical for the data. The lack of what property of the mean accounts for this result.

When are the adjacent values just the minimum and maximum observation?

Simple data sets have been given for you to try locating the descriptive metrics mentioned in this section. For each data set separately.

(a) Calculate the quartiles,

(b) calculate the interquartile range

(c)compile a five-number summary.

1,2,3,4,5,6
See all solutions

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