Mathematics
Mathematics, 10.07.2019 09:00, bnation5970

In a recent year, 11th grade new york public school students taking an english test produced test scores that were normally distributed with a mean of 81 and a standard deviation of 6. let x be a random variable that represents a test score. what is the lowest score that would still place a student in the top 40% of the scores?

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Mathematics, 28.06.2019 09:10, hahHcjckk
Scores this year for students taking the sat math test for the first time are believed to be normally distributed with mean . for students taking the test for the second time, this year's scores are also believed to be normally distributed, but with a possibly different mean . we wish to estimate the difference − . a random sample of the sat math scores of 100 students who took the test for the first time this year was obtained, and the mean of these 100 scores was ¯1=504.5 while the standard deviation was =100 . a random sample of the sat math scores of 30 students who took the test for the second time this year was also obtained, and the mean of these 30 scores was ¯2=539.1 while the standard deviation was =90 . using the conservative value for the degrees of freedom, a 95% confidence interval for − is: (−4.74,73.94) . (−3.10,72.30) . (1.92,67.28) .
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Mathematics, 09.10.2019 20:00, davidoj13
The state of virginia has implemented a standard of learning (sol) test that all public school students must pass before they can graduate from high school. a passing grade is 75. montgomery county high school administrators want to gauge how well their students might do on the sol test, but they don’t want to take the time to test the whole student population. instead, they selected 20 students at random and gave them the test. the results are as follows: 83 79 56 93 48 92 37 45 72 71 92 71 66 83 81 80 58 95 67 78 assume that sol test scores are normally distributed. a. compute the mean and standard deviation for these data. b. determine the probability that a student at the high school will pass the test. c. how many percent of students will receive a score between 75 and 95? d. what score will put a student in the bottom 15% in sol score among all students who take the test? e. what score will put a student in the top 2% in sol score among all students who take the test? g
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Mathematics, 28.10.2019 05:31, itislyz
Astandardized exam's scores are normally distributed. in a recent year, the mean test score was 1548 and the standard deviation was 319. the test scores of four students selected at random are 1990, 1280, 2240, and 1450. find the z-scores that correspond to each value and determine whether any of the values are unusual.
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Mathematics, 29.10.2019 13:31, Destinyb3722
Do students tend to improve their sat mathematics (sat-m) score the second time they take the test? a random sample of four students who took the test twice received the following scores: student 1 2 3 4 first score 450 520 720 600 second score 440 600 720 630 assuming that the change in sat-m score (second score – first score) for the population of all students taking the test twice is normally distributed with mean μ, are we convinced that retaking the test improves scores? what is the p-value for a test of h0: μ = μ0 versus ha: μ ≠ μ0? c. less than 0.01 a. more than 0.75 b. more than 0.10
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