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Which sample would produce an expected value of 20?
n= 25 scores from a population with mean =20
What is the percentage of scores less than 80 if mean is 100 and standard deviation is 20?
z = (80 - 100)/20 = -20/20 = -1 Look up a table of z-scores: Probability = 15.87%
What is the range of 80 90 90 95 100?
The range of a set of numbers is the difference between the highest and lowest values. In this case, the highest value is 100 and the lowest value is 80. Therefore, the range of the numbers 80, 90, 90, 95, and 100 is 20.
What is the relative dispersion with the mean of 45000 and a standard deviation of 9000?
Relative dispersion = coefficient of variation = (9000/45000)(100) = 20.
How do you find the mean of the data?
Th find the mean of a data set, you add up all the values in the data set and divide this sum by the number of data values. For example, the mean for the data set 2, 5, 6, and 7 is given as 2 plus 5 plus 6 plus 7, which is 20. You divide this sum by number of values in the data set, which is 4 to get 5 as the mean.
