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Q. 2.23

Expert-verifiedFound in: Page 98

Book edition
OER 2018

Author(s)
Barbara Illowsky, Susan Dean

Pages
902 pages

ISBN
9781938168208

The following data are the number of pages in 40 books on a shelf. Construct a box plot using a graphing

calculator, and state the interquartile range.

$136;140;178;190;205;215;217;218;232;234;240;255;270;275;290;301;303;315;317;318;326;333;343;$

$349;360;369;377;388;391;392;398;400;402;405;408;422;429;450;475;512$

We may deduce from the box plot that the distribution is more or less symmetrical, and that there are no outliers in the data.

Here we have$136;140;178;190;205;215;217;218;232;234;240;255;270;275;290;301;303;315;317;318;326;333;343;$

$349;360;369;377;388;391;392;398;400;402;405;408;422;429;450;475;512$

The box plot of the given number of pages is

By calculation we get the IQR as$161.$

The shape of the distribution is defined by the box plot.

It provides an overview of the quartiles.

As a result, we can quickly grasp the concepts of skewness and median.

The fundamental aspect of a boxplot is that it is primarily used to find outliers.

An outlier is a star that is outside of the acceptable range and is indicated on the plot.

There is no outlier in our situation.

The 1st quartile is represented by the end point of the boxplot below, while the $3rd$ quartile is represented by the end point of the boxplot above.

So the data in the boxplot is $50\%$ of the data, and the data outside of the interval is $50\%$ of the data.

We must also calculate $IQR=3rd$quartile $-1st$ quartile as a result of this.

1st quartile $=235.5,3rd$ quartile $=396.5$, according to the graph.

As a result, the IQR is $=396.5-235.5=161.$

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