Population of normally distributed aptitude scores
In a population of normally distributed aptitude scores of 1000 academy students with mean 70 and Standard deviation 10, how many score below 95?
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Out of curiosity, you look at authors of textbooks for your current courses. There're 12 authors in all. Would you be surprised if none of names of these authors were among the 10 most common? Provide a probability to support your answer. Your ans
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In a certain population, 0.1% of people are infected by HIV virus. A test is proposed to determine the virus carriers. For an infected person, the test gives positive result in 99% of cases; for an uninfected person, the test gives positive result
New york state has found that 30% of all consumers complaints are valid. If the state received 6000 complaints last year, about how many of them are expected to be valid? Find the standard deviation
A certain system has two components. There're 7 different models of first component and 11 different models of second. Any first component can be paired with any second component. A salesman should choose 2 of the first component and three of the
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For the normal distribution curve with mean of 6 and a standard deviation of 5, which of the following ranges of the variable will define an area under the curve corresponding to a probability of approximately 34%?
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