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 51 and a standard deviation of 0.6 inches. The distribution of output is normal. Within what values will 84.34 percent of sample means fall, if samples of n = 14 are taken and the process is in control?
50.461 , 51.538
50.149 , 51.85
50.772 , 51.227
49.527 , 52.472
None of the Above