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Statistics
Standard Normanl Drill: A. Find the number z such that the proportion of observations that are less than z in a standard Normal distribution is 0.8. B. Find the number z such that 35% of all observations from a standard Normal
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Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90,
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The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean µ = 20.4 and standard deviation = 5.8. 1) What is the probability that a randomly chosen student scored
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Mrs. Marble gave her 5th grade class a math test. The scores reflect a relatively normal distribution. The mean score for the group was 80 with a standard deviation of 8. Based upon this information, answer the following
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Suppose a normal distribution has a mean of 20 and a standard deviation of 4. What is the zscore value 0.52. Its standard deviations is less than the mean? 0.13 0.13 help please
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For a particular sample of 53 scores on a psychology exam, the following results were obtained. First quartile = 44 Third quartile = 68 Standard deviation = 8 Range = 55 Mean = 54 Median = 54 Mode = 71 Midrange = 64 I. What score
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Find the zscore such that the area under the standard normal curve to the left is 0.53.
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SAT math scores approx. follow a normal distribution, with mean 500 and standard deviation 100. What % of students should have an SAT math score above 500? I think I use mean (500) + zscore * SD (100), but I do not know how to
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We have no ideal on how to start this problem, we have look for it on the charts, did not see. Please help Consider the following. (Give your answers correct to two decimal places.) (a) Find the standard score (z) such that the
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