1. Specifications for a piece of material used in the manufacture of a bed mattress require that...
Question:
1. Specifications for a piece of material used in the manufacture of a bed mattress require that the piece be between 59.28 and 60.72 inches. The process that produces the piece yields a mean of 60 and a standard deviation of 0.6 inches. The distribution of output is normal. What percentage of the pieces will meet the length specs?
a. 95.44 %
b. 11.5 %
c. 88.49 %
d. 76.98 %
None of the Above
2. Specifications for a piece of material used in the manufacture of a bed mattress require that the piece be between a Lower and Upper value (in inches) centered around the process mean. The process that produces the piece yields a mean of 52 and a standard deviation of 0.7 inches. The distribution of output is normal. Within what values will 88.86 percent of sample means fall, if samples of n = 13 are taken and the process is in control?
a. 50.08, 53.919
b. 51.288, 52.711
c. 50.885, 53.114
d. 51.69, 52.309
None of the Above