Ex:           A company manufacturing inexpensive analog function generators measures the frequency they produce when set to 1 kHz. They measure the following values in Hz:

        f1 = 998       f2 = 997       f3 = 1003     f4 = 1001     f5 = 999       f6 = 1001

        f7 = 998       f8 = 1002     f9 = 1000     f10 = 1001   f11 = 1000

Make a histogram of the data for a bin size of 1 Hz with one of the bins centered on 1 kHz. (In other words, one of the bins is for 999.5 to 1000.5 Hz.)

Sol'n:      The histogram is bar chart showing how many values fall into each bin. In the present case, the bins correspond to integer frequencies, and we need only count how often each frequency occurs:

bin          # values in bin

997                   1

998                   2

999                   1

1000                   2

1001                   3

1002                   1

1003                   1

The values in the second column are the heights of the bars on the histogram: