Table 15-1 Refer to Table 15-1. Bags of chocolate candy are sampled to ensure pr

Question

Table 15-1

Refer to Table 15-1. Bags of chocolate candy are sampled to ensure proper weight. The overall average for the samples is 36 ounces. Each sample contains eight bags. The average range is 1.3 ounces. The lower control chart limit for the sample averages would be

36.4849.

35.6270.

36.3730.

35.5150.

None of the above

Sample Size
n Mean Factor
A2 Upper Range
D4 Lower Range
D3 2 1.880 3.628 0 3 1.023 2.574 0 4 0.729 2.282 0 5 0.577 2.114 0 6 0.483 2.004 0 7 0.419 1.924 0.076 8 0.373 1.864 0.136 9 0.337 1.816 0.184 10 0.308 1.777 0.223 12 0.266 1.716 0.284

Explanation / Answer

lower control chart limit for the sample averages =sample mean -A2*Raverage =36-0.373*1.3 =35.5151

therefore option 35.5150 is correct

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