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statistics
Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bellshaped. c. If a population has normal ditribution, the mean and the

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Scores on the SAT verbal test in recent years follow approximately N(504,111) distribution. What is the proportion of students scoring between 450 and 550? How high must a student score to place in the top 10% of all students

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In a normal distribution, what zscore value separates the highest 90% of the scores from the rest of the distribution? a)z = 1.28 b)z = 1.28 c)z = 0.13 d)z = 0.13

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Scores on a test have a mean of 66 and Q3 of 81. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth.

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Scores on the verbal section of the SAT have a mean of 500 and a standard deviation of 100. If someone scored at the 90th percentile, what is their SAT score?

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The GMAT test is required for admission to most graduate programs in business. In a recent year, the GMAT test scores were normally distributed with a mean of 550 and standard deviation of 100. A. Find the first quartile for the

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A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section. The population standard deviation of the SAT is known to be 100. Use an alpha level

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Scores on a test have a mean of 66 and Q3 is 80. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth. 10.5 18.7 20.9 9.4

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The box plot below summarize the distributions of SAT verbal and math scores among students at an upstate New York high school. 300 400 500 600 700 800 data Whic of the following statements is false? 1. The range of the math

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IQ scores are normally distributed with a mean u = 100 and a standard deviation o =15. Based on distribution, determine % of IQ scores between 100 and 120 =

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Among first year students at a certain university, scores on the Verbal SAT follow the normal curve; the average is around 550 and the SD is about 100. a) what percentage of these students have scores in the range 400 to 700? b)

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Assume that math SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. A score of 560 reprecents what percentile? Please round answer to the neareast tenth.
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