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Using the 689599.7rule. Assume that a set of test scores is normally distributed with a mean of 80 and a standard deviation of 25. Use the 689599.7 rule to find the following quantities. percentage of scores greater than 105
asked by Nisa on January 24, 2016 
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The scores on a math test are normally distributed. if the mean is 72 and the standard deviation is six, what is the range of 98% of the scores?
asked by Barb on July 22, 2019 
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1) Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that
asked by joane on October 24, 2012 
statistics
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 689599.7 rule to find the following quantities: Suggest you make a drawing and label first… a. Percentage of
asked by Ab on July 13, 2010

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A researcher was interested in the emotional effects of music on exam performance. Before their exam, a professor took one group of students into a room in which calming music was played. A different group of students were taken
asked by Rachael on September 21, 2013 
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5. Scores on a recent national statistics exam were normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected exam will have a score of at least 71? b. What
asked by Zac on March 5, 2012 
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A sociology professor assigns letter grades on a test according to the following scheme. A: Top 14% of scores B: scores below the top 14% and above the bottom 55% C: scores below the top 45% and above the bottom 17% D: scores
asked by Benjamin on October 14, 2017 
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The raptor program displays the grade for each test score and the average of all four test scores. Use a loop to input four test scores. Validate the input. The test scores must be between 0 and 100.
asked by joe on November 17, 2019

statistics
A researcher is testing the hypothesis that consuming a sports drink during exercise improves endurance. A sample of n=50 male college students is obtained and each student is given a series of three endurance tasks and asked to
asked by Melissa Williams on March 18, 2011 
statistics
Nine students took the SAT. Their scores are listed below. Later on, they read a book on test preparation and retook the SAT. Their new scores are listed below. Construct a 95% confidence interval for µ d (the true mean
asked by Anonymous on December 6, 2013 
statistics
In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 70 and 90? A. 68% B. 80% C. 95% D. 99%
asked by StudentD on August 15, 2012 
Statistics  M/C
14. The marks on a statistics test are normally distributed with a mean of 62 and a variance of 225. If the instructor wishes to assign B’s or higher to the top 30% of the students in the class, what mark is required to get a B
asked by Rhea on October 23, 2010
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