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The thickness of wafers in semiconductor manufacturing has a mean of 10 micrometers and standard deviation of 0.8 micrometers. Find approximate probability that the average thickness of 49 wafers exceeds 10.15 micrometers.
Statistics and Probability, Statistics
It has been a bad day for the stock market and you have heard that only 30% of all stocks gained value. Suppose you have a portfolio of 10 securities and assume a binomial distribution for the number of your stocks that ...
If the return on stock A in year 1 was 11 %, in year 2 was -10 %, in year 3 was -4 % and in year 4 was 2 %, what was the standard deviation of returns for stock A over this four year period? (Round your answer to 1 decim ...
A population has a mean u=81 and a standard deviation o=28. Find the mean and standard deviation of a sampling distribution of sample means with a sample size n=239. ux= ox=
If you know your raw score is 35, your z score is -3, and your t score is 20. The mean is 50 and the standard deviation is 5. How would you use this information to solve for a percentile rank?
A manufacture makes makes two models of an item. Model 1 which accounts for 89% of unit sales, and model 2, which accounts for 11% of unit sales. Because of defects the manufacture has to replace (or exchange) 11% of its ...
Question Probability and nonprobability are the two general categories of sampling. Probability sampling uses random selection, whereas nonprobability sampling does not. For example, if you wanted to study the effects of ...
The mean time it takes a technician to resolve a software Issue is 18 minutes with a standard deviation or 4.2 minutes. This information was obtained from a random sample of 10 monitored calls. A sample of 15 monitor cal ...
A new type of soft drink from Frackly Inc. is sold in 500 milliliter (ml) bottles. The mean volume of drink placed in a bottle is 490 ml with a standard deviation of 6.1 ml. Assuming a normal distribution of the data, wh ...
A box contains n white and m black balls. One ball is added randomly, white with probability p and black with probability 1 - p. Then a random ball is taken out from the box. (a) Find the probability that the taken ball ...
According to the center for Disease Control, the mean total cholesterol for men between the ages of 20-29 is 180 milligrams per deciliter with a standard deviation of 36.2. A healthy total cholesterol level is less than ...
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