Chapter 12: The number of dry cell batteries in a test and the
number of defective units for 14 consecutive samples.

Col 1: Sample number
Col 2: Number in test
Col 3: Number of defectives

1      312     4
2      356     6
3      412     6
4      260     7
5      465    12
6      362     4
7      508    11
8      241     5
9      216     9
10     292     4 
11     396     6
12     452     8
13     480     7
14     405     5