SOLUTION: I have two questions: Many college graduates who are employed full-time have longer than -hour work weeks. Suppose that we wish to estimate the mean number of hours, , worked p

Question 483226: I have two questions:
Many college graduates who are employed full-time have longer than -hour work weeks. Suppose that we wish to estimate the mean number of hours, , worked per week by college graduates employed full-time. We'll choose a random sample of college graduates employed full-time and use the mean of this sample to estimate . Assuming that the standard deviation of the number of hours worked by college graduates is hours per week, what is the minimum sample size needed in order for us to be confident that our estimate is within hours per week of ?
Second Question:
Bags of salt that are hand packed at a shop have a μ of 500 g and a σ of 35 g. The bags are packed in boxes of 100 units.
Calculate the probability that the mean weight of the bags in a box is less than 495 g.

Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
2)

z=(495-500)/3.5=5/3.5=-1.43
area under norm curve below z=-1.43 is .0764 the probability that the mean weight of the bags in a box is less than 495 g.
.
Ed

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