The concentration of impurities in a semiconductor used in the production of microprocessor for computer is a normally distributed random variable with mean 127parts per million and standard deviation 22parts per million.A semiconductor is acceptable only if it's concentration of impurities is below 150 parts per million.what is the proportion of the semiconductor that are accepted for use? (The area under the standard normal curve for value of z=1.05 is 0.3531)
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2=937927=873 ?2 (937028 (928207pw
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