Question 3.29: Systolic Blood Pressure The frequency distribution for the s......

Systolic Blood Pressure

The frequency distribution for the systolic blood pressure readings (in millimeters of mercury, mm Hg) of 200 randomly selected college students is shown here. Construct a percentile graph.

 A Class boundaries B Frequency C Cumulative frequency D Cumulative percent 89.5–104.5 24 104.5–119.5 62 119.5–134.5 72 134.5–149.5 26 149.5–164.5 12 164.5–179.5 4 200
Step-by-Step
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Step 1 Find the cumulative frequencies and place them in column C.
Step 2 Find the cumulative percentages and place them in column D. To do this step, use the formula

Cumulative % =$\frac{\text{cumulative frequency}}{n}$ · 100

For the first class,

Cumulative % =$\frac{24}{200}$ · 100 = 12%

The completed table is shown here.

Step 3 Graph the data, using class boundaries for the x axis and the percentages for the y axis, as shown in Figure 3–6.

 A Class boundaries B Frequency C Cumulative frequency D Cumulative percent 89.5–104.5 24 24 12 104.5–119.5 62 86 43 119.5–134.5 72 158 79 134.5–149.5 26 184 92 149.5–164.5 12 196 98 164.5–179.5 4 200 100 200

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