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the fluctation power (in W) in a micro lamp was measured five times, and the measured values were? 60.15 59.69 59.98 59.66 and 59.65. Find the standard deviation and variance for the data. rounding to the nearest thousandths. ... (Asked by missy w)
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[((x1-average)^2)+((x2-average)^2)+ ...+((xn-average)^2)]/(n-1)=variance n is the number of measurements, average is the average of the measurements, x1, x2,...,xn are individual measurements. square root of variance =standard deviation or standard deviation^2= variance For your data stdev=0.226781833488569 square this and get var=0.0514300000004368 Now round your answer to thousandths place. If you look up standard deviation (stdev) in excel help you'll find this along with the formula. STDEV Estimates standard deviation based on a sample. The standard deviation is a measure of how widely values are dispersed from the average value (the mean). Syntax STDEV(number1,number2,...) Number1,number2,... are 1 to 30 number arguments corresponding to a sample of a population. You can also use a single array or ...(Answered by jason s)

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how does standard deviation std work? ok, if a class is curved.....how does the standard deviation work? say, the std is 7.5, so does that mean 7.5 points above or below the average is C- and C+ please, someone who understands, let me know thnx! ... (Asked by Chris)
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ok what is the mean score of the Test. Lets say the Mean score is 50 The standard d is 7.5. The +1 SD = 57.5 The -1 SD = 43.5 the scores that fall in that range make up scores of 68% of the students who took that test. If you need more help email me. I am a teacher who has a masters in assessment. my email is the same as my yahoo ID Good luck...(Answered by itsgood2b_king)

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verify that a z score has a mean of 0 and a standard deviation of 1? ... (Asked by Audrey M)
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how many people score 800 on the math section of the SAT.? Or at least i am looking for a percentile. For 2006 seniors, there were 1,466,000 students who took the test. The average was 518, and the standard deviation was 115. ... (Asked by sum1)
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Well...if you assume this is a normal (Gaussian) distribution: an 800 is: (800-518)/115 = 2.45 standard deviations above the mean If someone looks at a normal distribution table: http://www.statsoft.com/textbook/sttable.html The probability of being 2.45 standard deviations or above is: 0.5 - 0.4929 = 0.0071 Roughly 0.7%. For the true answer...I think its lower than 0.7%...(Answered by Doug)

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what is the standard deviation on a typical exam? ... (Asked by tidge)
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There is no typical exam. Standardized tests have a standard deviation but there is no one SD that fits for all (or even a majority of the tests). For the case of intelligence (general) testing, the mean is 100 and the SD is 15. However every test has its own standard deviation based on the scores achieved. The exceptions are those with huge standardization data sets (IQ, SAT, PSAT, ACT...) You can find the SD for these tests on their websites and in some research papers as well. Overall, every time the test changes there tends to be a change ...(Answered by ThinkingMan2006)

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