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The length of certain bricks is a random variable with a mean of 8 inches and a standard deviation of 0.1 inch, and the thickness of the mortar between two bricks is a random variable with a mean of 0.5 inch and a standard deviation of 0.03 inch. What is the mean and the standard deviation of the length of a wall made of 50 of these bricks laid side by side, if we can assume that all the random variables involved are independent?
How many packages should be sampled in order to be 90% confident of being within 0.9% of the actual population percentage delivered damaged.
The average number of chocolate chips in a particular brand of chocolate chip chewy cookie is 19. The standard deviation is 2.6.
Find the probability that 5 randomly selected high school students will say that they exercise regularly. Express your answer for this item in percent.
Use an alpha level of .01 and test the hypothesis that the two methods are producing the same mean.
virginia is the star player on her middle school basketball team. if she makes 3 free throws and misses 2 free throws
A young woman in that age group is randomly selected; independently, a young man in that age group is randomly selected. What is the probability that the young man is taller than the young woman by more than 5 inches
problem based on decision tree.a manufacturer must decide whether to extend credit to a retailer who would like to open
Is there sufficient evidence at the 0.05 level of significance to conclude that the proportion of women physicians at the university health system exceeds 27.9%?
Suppose the waiting time at a restaurant is normally distributed with a mean of 12 minutes and a standard deviation of 6 minutes.
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
Many vehicles used in space travel are constructed with redundant systems to protect the flight crew and their equipment. Find the probability that this shuttle component functions successfully if n = 2.
heights of men on a baseball team have a bell shape distribution with a mean of 172cm and a standard deviation of 5cm.
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