Scores on a test have a mean of 71.1 and 7 percent of the scores are above 88 . The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth, if necessary.
Scores on a test have a mean of 71.1 and 7 percent of the scores are...
Scores on a test have a mean of 71.1 and 7 percent of the scores are above 88. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth, if necessary.
Scores on a test have a mean of 78.4 and 7 percent of the scores are above 90. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth, if necessary.
ACT scores have a mean of 21 and 6 percent of the scores are above 28. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth, if necessary. how do you solve this in excel?
ACT scores have a mean of 21.5 and 5percent of the scores are above 29 . The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth, if necessary.
The scores on a test from an entire class (ie. entire population) are listed below. Find the mean and standard deviation of the scores. Then determine what percent of the data is within 1 standard deviation of the mean. 71 72 71 82 79 65 77 71 73 78 75 The mean is 74 (Simplify your answer) The standard deviation is 4.6 (Simplify your answer. Round to the nearest tenth) % of the data is within 1 standard deviation of...
27. On a standardized test with a normal distribution, the mean was 64.3 and the standard deviation was 5.4. What is the best approximation of the percent of scores that fell between 61.6 and 75.1? 28. The mean of a normally distributed set of data is 52 and the standard deviation is 4. Approximately 95% of all the cases will lie between which measures? 29. Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and...
4. If test scores are approximately normally distributed with mean 82 and standard deviation 8. What score would correspond to the 80th percentile? Round to the nearest tenth.
Mathematics achievement test scores for 500 students were found to have a mean and a variance equal to 510 and 3600, respectively. If the distribution of test scores was mound-shaped, approximately how many of the scores would fall into the interval 450 to 570? (Round your answer to the nearest whole number.) scores Approximately how many scores would be expected to fall into the interval 390 to 630? (Round your answer to the nearest whole number.) scores
Scores on a particular test after a job training course are approximately normal with mean 100 and standard deviation 15. (a) People with scores below 70 are required to repeat training and retake the test. What percent of trainees must repeat training? (Round your answer to two decimal places.) blank % (b) People with scores of 130 or higher are sent for further technical training. What percent of trainees qualify for further training? (Round your answer to two decimal places.) blank %
Suppose that composite scores on the ACT test for the school graduating class in a certain year had a mean of 24.2 and a standard deviation of 4.6. In all, 1,823,241 students in this class took the test, and of these, 6,947 had scores higher than 36.4 and 2,404 had scores exactly 36.4. ACT scores are always whole numbers, but the Normal N(24.2, 4.6) distribution can include any value, not just whole numbers. What is more, there is no area...