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specifications for a part of a DVD player

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Question

need help with this question:specifications for a part of a DVD player state that the part should weigh

between 24.8 and 25.8 ounces. The process that produces the parts has a mean of 25.3 ounces and a standard deviation of .21 pounces. The distribution of output is normal (use Table A normal curve 0 to z).

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 95.44 percent of sample means of this process fall, if samples of n= 11 are taken and the process is in control (random) Round your answers to 2 decimal places

Lower values, Upper values

 
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