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2-3 example1 - Student Grady Simonton Course Math119...

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Unformatted text preview: Student: Grady Simonton Course: Math119: Elementary Statistics - Spring 2.010 - CRN: 49239 Instructor: Shawn Parvini - 16 weeks Date: 2/18/10 Book: Triola: Elementary Statistics, 11e Time: 11:04 ANI The histogram to the right represents the weights (in pounds) of members of a certain high-school track team. How many team members are included in the histogram? 105 115 125 135 145 155 165 A histogram is a bar graph in which the horizontal scale represents classes of data values and the vertical scale represents frequencies. The heights of the bars correspond to the frequency values, and the bars are drawn adjacent to each other (without gaps). The sample size can be found by adding the heights of all the bars in the histogram. In the histogram above, the y-axis is ticked for every l-person increase in frequency, so the number of team members in each class is given by the height of the bar in ticks. In the following table, enter the appropriate frequencies. Class midpoint 105 115 125 135 145 155 165 Frequency 1 2 4 5 4 2 1 Thus, the number of team members represented by the histogram is the sum of the frequencies. l+2+4+5+4+2+1=19 Page 1 ...
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