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Mathematics LibreTexts

18.11: Describing Data

  • Page ID
    41801
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    1.

    1. Different tables are possible

    \(\begin{array}{|l|l|}
    \hline \text { Score } & \text { Frequency } \\
    \hline 30 & 1 \\
    \hline 40 & 0 \\
    \hline 50 & 4 \\
    \hline 60 & 3 \\
    \hline 70 & 6 \\
    \hline 80 & 5 \\
    \hline 90 & 2 \\
    \hline 100 & 3 \\
    \hline
    \end{array}\)

    1. This is technically a bar graph, not a histogram:

    clipboard_ea99cefb4a8bc3d6c75c46cd897e990c1.png

    clipboard_e0fcb81c339f46050406fc822de454710.png

    3.

    1. \(5+3+4+2+1=15\)
    2. \(5 / 15=0.3333=33.33 \%\)

    5. Bar is at \(25 \% .25 \%\) of \(20=5\) students earned an \(A\)

    7.

    1. \((7.25+8.25+9.00+8.00+7.25+7.50+8.00+7.00) / 8=\$ 7.781\)
    2. In order, 7.50 and 8.00 are in middle positions. Median \(=\$ 7.75\)
    3. \(0.25 * 8=2\) \(\mathrm{Q} 1\) is average of \(2^{\mathrm{nd}}\) and \(3^{\mathrm{rd}}\) data values: \(\$ 7.375 \quad 0.75 * 8=6 . \mathrm{Q} 3\) is average of \(6^{\mathrm{th}}\) and \(7^{\mathrm{th}}\) data values: \(\$ 8.125\) 5-number summary: \(\$ 7.00, \$ 7.375, \$ 7.75, \$ 8.125, \$ 9.00\)
    4. \(0.637\)

    9.

    1. \((5 \times 0+3 \times 1+4 \times 2+2 \times 3+1 \times 5) / 15=1.4667\)
    2. Median is 8th data value: 1 child
    3. \(0.25 \times 15=3.75 .\) Q1 is 4 \(^{\text {th}}\) data value: 0 children \(0.75 \times 15=11.25 .\) Q 3 is \(12^{\text {th}}\) data value: 2 children 5 -number summary: 0,0 1,2,5
    4. clipboard_e9f1f1ea7c3ee82b36ee6da2e01e6dacf.png

    11. Kendra makes $90,000. Kelsey makes $40,000. Kendra makes $50,000 more.


    18.11: Describing Data is shared under a CC BY-SA 3.0 license and was authored, remixed, and/or curated by David Lippman via source content that was edited to conform to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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