Question: In the dorben company, the work measurement analyst carried out a detailed time study of mold making. The third element of the study has the greatest variation in time. After studying nine cycles the analyst will calculate the mean and the standard deviation of that element with the following results;

If the analyst wants to have a confidence of 90% so that the average time of the sample is within + - 10% of the population average,

1. What is the total number of observations the analyst should take?

B) Within what percentage of the average of the total population is on 95% confidence level and with the average observations?

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