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A production process sampled 24 times with a sample size of 6 yields an overall mean of 25.2 and an average range of 0.8. Calculate
A production process sampled 24 times with a sample size of 6 yields an overall mean of 25.2 and an average range of 0.8. Calculate the lower control limit for the mean based on 3 standard deviations.
a. 24.8
b. Cannot be determined with the information given
c. 25.6
d. 25.1
e. 22.8
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