Exam 2: Organizing and Summarizing Data

The local police, using radar, checked the speeds (in mph) of 30 motorists in a construction area. The results arelisted below. Construct a frequency polygon using six classes and a class width of 3. 44 38 41 50 36 36 43 42 49 48 35 40 37 41 43 50 45 45 39 38 50 41 47 36 35 40 42 43 48 33

For the data below, construct a frequency distribution and a relative frequency distribution. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11

The data set: weekly grocery bills (in dollars) for 20 randomly selected households 135 120 115 132 136 124 119 145 98 110 125 120 115 130 140 105 116 121 125 108

True or False: The sum of all the relative frequencies of a distribution will always add up to 1.

The April precipitation amounts (in inches) for 40 cities are listed below. Construct a frequency distribution, arelative frequency distribution, a cumulative frequency distribution, and a relative cumulative frequencydistribution using eight classes. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8 3.1 2.4 2.4 2.3 1.6 1.6 4.0 3.1 3.2 1.8 2.2 2.2 1.7 0.5 3.6 3.4 1.9 2.0 3.0 1.1 3.0 4.0 4.0 2.1 1.9 1.1 0.5 3.2 3.0 2.2

The 30 students in Mrs Harrisonʹs literature class were asked how many cousins they had. The results areshown below. Construct a relative-frequency histogram using a class width of 2. 10 1 3 5 4 7 5 1 0 9 11 1 5 4 1 7 7 11 0 6 6 1 5 7 10 1 1 5 6 0

The heights (in inches) of 30 lawyers are listed below. Construct a frequency ogive using five classes. 70 72 71 70 69 73 69 68 70 71 67 71 70 74 69 68 71 71 71 72 69 71 68 67 73 74 70 71 69 68

The local police, using radar, checked the speeds (in mph) of 30 motorists on a rural road. The results are listedbelow. Construct a frequency ogive using six classes. 44 38 41 50 36 36 43 42 49 48 35 40 37 41 43 50 45 45 39 38 50 41 47 36 35 40 42 43 48 33

The weights (in pounds) of babies born at St Maryʹs hospital last month are summarized in the table. Weight (lb) Number of Babies 5.0-5.8 7 5.9-6.7 18 6.8-7.6 20 7.7-8.5 10 8.6-9.4 5 Find the class width.

The local police, using radar, checked the speeds (in mph) of 30 motorists in a construction area. The results arelisted below. Construct a frequency bar graph and a relative frequency bar graph. Speed Frequency 33-35 3 36-38 6 39-41 6 42-44 6 45-47 3 48-50 6

A sample of 25 community service projects is obtained and the scores are recorded. The results are shownbelow. Construct a frequency histogram for this data. 97 96 96 95 96 99 97 97 100 99 95 98 95 96 100 95 98 96 96 100 95 97 99 97 98 3 Organize continuous data in tables.

True or False: Relative frequency is the proportion (or percent) of observations within a category and is foundusing the formula: relative frequency = $=\frac{\text { sum of all frequencies }}{\text { frequency }} .$

The heights (in inches) of 30 lawyers are listed below. Construct a relative frequency ogive using five classes. 70 72 71 70 69 73 69 68 70 71 67 71 70 74 69 68 71 71 71 72 69 71 68 67 73 74 70 71 69 68

The June precipitation amounts (in inches) for 40 cites are listed below. Construct a frequency distribution anda relative frequency distribution using eight classes. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8 3.1 2.4 2.4 2.3 1.6 1.6 4.0 3.1 3.2 1.8 2.2 2.2 1.7 0.5 3.6 3.4 1.9 2.0 3.0 1.1 3.0 4.0 4.0 2.1 1.9 1.1 0.5 3.2 3.0 2.2

What was the revenue for the first quarter of Year 1?

The March utility bills (in dollars) of 30 homeowners are listed below. Construct a stem-and-leaf plot for thedata. 44 38 41 50 36 36 43 42 49 48 35 40 37 41 43 50 45 45 39 38 50 41 47 36 35 40 42 43 48 33

Weight (in pounds) Frequency 135-139 6 140-144 4 145-149 11 150-154 15 155-159 8

For the data below, construct a frequency histogram and a relative frequency histogram. Weight (in pounds) Frequency 135-139 6 140-144 4 145-149 11 150-154 15 155-159 8

The heights (in inches) of 30 mechanics are listed below. Construct a stem-and-leaf plot for the data. 70 72 71 70 69 73 69 68 70 71 67 71 70 74 69 68 71 71 71 72 69 71 68 67 73 74 70 71 69 68