the heights (in inches) of 30 adult males are listed below. Construct a frequency distribution using five classes.
write the word or phrase that best completes the statement.
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 smallest value is 67 and the largest value is 74.
Subtract them:
74 - 67 = 7
Divide by 5, the number of classes:
1.5
5)7
5
26
25
1
Round up to 2, the width of the class.
Subtract .5 from smallest value as the beginning
of the smallest class, get 66.5, draw a line,
add 2, getting 68.5 write that down on the right
of the line:
66.5---68.1
Begin the next line with the value on the right,
draw a line, add 2, getting 70.1. Write that
down on the right of the line. So now you have:
66.5---68.1
68.1---70.1
Continue until you have this:
66.5---68.5
68.5---70.5
70.5---72.5
72.5---74.5
74.5---76.5
Label that column CLASS and beside it
label another column FREQUENCY, and in that
column list how many you count that are in
each class:
CLASS FREQUENCY
66.5---68.5 6
68.5---70.5 10
70.5---72.5 10
72.5---74.5 4
74.5---76.5 0
Edwin
