A First Course in Quality Engineering, 2nd Edition

54 A First Course in Quality Engineering

Step 3: Determine the limits for the cells, and tally the observations in each

cell� The tally gives the frequency distribution of the data in the number

of values falling in each cell� Calculate the percentage frequency distri-

bution by calculating the percentage of data falling in each cell out of

the total number of values in the sample�

Step 4: Draw a graph with the cell limits on the x-axis and the percentage

frequency on the y-axis using convenient scales� The resulting graph is

a histogram�

Example 2.2

The data below represent the amount of deodorant, in grams, filled in a filling line

of a packaging firm. Draw the histogram of the data.

Solution

Step 1: The data are in Table 2.1. n = 100.

Step 2: Largest ...