BUSI 411 Homework 10 Quality Control Assignment solutions complete answers
Specifications for a part for a 3-D printer state that the part should weigh between 25.5 and 26.5 ounces. The process that produces the parts has a mean of 26.0 ounces and a standard deviation of .22 ounce. The distribution of output is normal. Use Table-A.
a.What percentage of parts will not meet the weight specs? (Round your "z" value and final answer to 2 decimal places.)
b.Within what values will 99.74 percent of the sample means of this process fall if samples of n = 12 are taken and the process is in control (random)? (Round your answers to 2 decimal places.)
c. Using the control limits from part b, would the following sample means be in control? 24.52, 24.53, 24.44, 24.51, 24.41, 24.39
The lower and upper specifications for a software upgrade are 77 minutes and 81 minutes. Estimate the percentage of process output that can be expected to fall within the specifications. (Round your answer to 1 decimal place.)
A production process consists of a three-step operation. The scrap rate is 15 percent for the first step and 9 percent for the other two steps.
a. If the desired daily output is 492 units, how many units must be started to allow for loss due to scrap? (Do not round intermediate calculations. Round up your final answer to the next whole number.)
b. If the scrap rate for each step could be cut in half at every operation, how many units would this save in terms of the scrap allowance? (Do not round intermediate calculations. Round up your final answer to the next whole number.)
c. If the scrap represents a cost of $10 per unit, how much is it costing the company per day for the original scrap rate (i.e. the Part a scrap rate)? (Round your final answer to the nearest whole number.)
