You should now record this value of u = 0.007 in the box provided on the chart...

Defects (c) | 6 | 8 | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|

Sample Size (n) | 950 | 1175 | |||||||||

Proportion (u = c / n) | 0.006 | 0.007 |

...and plot a point at the appropriate position on the 2nd vertical line on the u graph.

Notice that the two plots have been linked by a straight line. Do this on your printed chart now.