What percentage of students have scores more than nancy
the combined sat scores of students are normally distributed with a mean of 950 and a standard deviation of 200. nancy bright's sat score was 1390. what percentage of students have scores more than nancy bright?
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90% confidence interval with a margin of error of 2 minutes. a normal distribution with a standard deviation of 30 minutes. the number of observation required is ?
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.A statistic practitioner randomly sampled 1,500 observations and found = 14 and s = 22. Test to determine whether there is enough evidence at the 5% significance level to infer that the population mean is less than 15.
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