Question

In: Statistics and Probability

Construct a frequency polygon for the following: 60-69   12 70-79   15 80-89    10 90-99      2 100-109...

Construct a frequency polygon for the following:
60-69   12
70-79   15

80-89    10

90-99      2

100-109 1

110-119   0

120-129   1


Solutions

Expert Solution

The frequency polygon is obtained in following steps in excel,

Step 1: Write the data values in excel.

Class Frequency
60-69 12
70-79 15
80-89 10
90-99 2
100-109 1
110-119 0
120-129 1

Step 2: make a column mid point by taking the mid point of class interval.

Class Mid point Frequency
60-69 64.5 12
70-79 74.5 15
80-89 84.5 10
90-99 94.5 2
100-109 104.5 1
110-119 114.5 0
120-129 124.5 1

Step 3: Now Select the midpoint and frequency column then INSERT > Recommended Plots > Lines > OK. The screenshot is shown below,

The Chart is obtained. The screenshot is shown below,

The frequency polygon show a normal distribution skewed to right.

orchestra answered 1 year ago
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