Table 15-1
-Refer to Table 15-1.To guarantee that cans of soup are properly filled,some cans are sampled and the amounts measured.The overall average for the samples is 12 ounces.Each sample contains 10 cans.The average range is 0.4 ounces.The upper control chart limit for the sample averages would be
A)12.1232.
B)11.8768.
C)13.2.
D)12.308.
E)None of the above

Question

Table 15-1 
-Refer to Table 15-1.To guarantee that cans of soup are properly filled,some cans are sampled and the amounts measured.The overall average for the samples is 12 ounces.Each sample contains 10 cans.The average range is 0.4 ounces.The upper control chart limit for the sample averages would be
A)12.1232. 
B)11.8768. 
C)13.2. 
D)12.308. 
E)None of the above

Quizplus · Accepted Answer

The upper control chart limit for the sample averages would be 12.1232. This is calculated by adding 3 standard deviations to the overall average. The standard deviation is calculated by dividing the average range by the square root of the sample size. In this case, the average range is 0.4 ounces and the sample size is 10. Therefore, the standard deviation is 0.4 / sqrt(10) = 0.1265. The upper control chart limit is then calculated as 12 + 3 * 0.1265 = 12.1232.

Table 15-1 -Refer to Table 15-1.To Guarantee That Cans of Soup Are