Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 2 - Frequency Distributions and Graphs - 2-1 Organizing Data - Exercises 2-1 - Page 53: 23


\begin{array}{c}& \textbf{Watts per Hour} & \textbf{Frequency} \\\hline & \text{77-83} & \text{1} \\ & \text{84-90} & \text{1} \\ & \text{91-97} & \text{6} \\ & \text{98-104} & \text{14} \\ & \text{105-111} & \text{8} \\ & \text{112-118} & \text{1} \\ & \text{119-125} & \text{1} \end{array}

Work Step by Step

Find the highest and lowest values. $H=123$ $L=77$ Find the range. $R=H-L=123-77=46$ Find the class width by dividing the range my the number of classes. $W=\frac{R}{C}=\frac{46}{7}=6.57$ Round up to the nearest whole number. $W=7$ Add the width to the lowest value to get the lower limit of the next class. Start with 0 since the lowest value is 0.8. ind the upper limit of each class by subtracting 1 from the lower limit of the next class. $77+7=84$ $84+7=91$ $91+7=98$ $98+7=105$ $105+7=112$ $112+7=119$ $119+7=126$ Tally the frequency for each category and enter the results in the table.
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