how to find standard deviation and mean from probability?
309084
The formula for standard deviation is sqrt([sample size][probability of success](1-[probability of success])). To find the sample size from the mean and success rate, you divide the mean by the success rate. If mean=10 and success=0.2, you do 10/0.2 to get your sample size, or 50 in this case.
43171
['Step 1: Calculate the mean of the data—this is xˉx, with, \\bar, on top in the formula.', 'Step 2: Subtract the mean from each data point. ... ', 'Step 3: Square each deviation to make it positive.', 'Step 4: Add the squared deviations together.']
1274294
Calculating Standard Error of the Mean First, take the square of the difference between each data point and the sample mean, finding the sum of those values. Then, divide that sum by the sample size minus one, which is the variance.
897672
['Estimate the sample mean for the given sample of the population data.', 'Estimate the sample standard deviation for the given data.', 'Dividing the sample standard deviation by the square root of sample mean provides the standard error of the mean (SEM).']
916902
['First, work out the average, or arithmetic mean, of the numbers: Count: (How many numbers) ... ', 'Then, take each number, subtract the mean and square the result: Differences: -7.6, -1.6, 5.4, 4.4, -0.6. ... ', 'Now calculate the Variance: Sum of Differences2: 109.2. ... ', 'Lastly, take the square root of the Variance: Standard Deviation:']
541784
['Step 1: Calculate the mean of the data—this is μ in the formula.', 'Step 2: Subtract the mean from each data point. ... ', 'Step 3: Square each deviation to make it positive.', 'Step 4: Add the squared deviations together.', 'Step 5: Divide the sum by the number of data points in the population.']
613177
Example: Population standard deviation Step 2: Subtract the mean from each score. Step 3: Square each deviation. Step 4: Add the squared deviations. Step 5: Divide the sum by the number of scores.
190650
['Step 1: Calculate the mean of the data—this is xˉx, with, \\bar, on top in the formula.', 'Step 2: Subtract the mean from each data point. ... ', 'Step 3: Square each deviation to make it positive.', 'Step 4: Add the squared deviations together.', 'Step 5: Divide the sum by one less than the number of data points in the sample.']
360517
['Find the difference each number is away from the mean, and then square that difference. For example, subtract 38 from 21 and then square the result. ... ', 'Add together the two values you calculated in the previous step. ... ', 'Divide your solution from the previous step by two since you have two observations.']
6927
['Mean of Sample is the same as the mean of the population.', 'The standard deviation which is calculated is the same as the standard deviation of the population divided by the square root of the sample size.']
7154
['Calculate the mean.', 'Subtract the mean from each observation.', 'Square each of the resulting observations.', 'Add these squared results together.', 'Divide this total by the number of observations (variance, S2).', 'Use the positive square root (standard deviation, S).']
1435840
['Calculate the mean.', 'Calculate the standard deviation using the formula: s= √ ((∑ X(squared)/N)–X-bar)', 'Calculate the standard error of the mean using the formula: s/√ N-1.', 'Determine the value of T from the t-table.']
431173
Find the standard deviation of all the x-values (call it sx) and the standard deviation of all the y-values (call it sy). Add up the n results from Step 3. Divide the sum by sx ∗ sy. Divide the result by n – 1, where n is the number of (x, y) pairs.
662762
Calculating Standard Error of the Mean First, take the square of the difference between each data point and the sample mean, finding the sum of those values. Then, divide that sum by the sample size minus one, which is the variance. Finally, take the square root of the variance to get the SD.
772259
['Calculate the mean (simple average of the numbers).', 'For each number: Subtract the mean. Square the result.', 'Calculate the mean of those squared differences. ... ', 'Take the square root of that to obtain the population standard deviation.']
1253958
['Work out the mean. ... ', 'Then for each number: subtract the Mean and square the result. ... ', 'Then work out the mean of those squared differences. ... ', 'Take the square root of that: ... ', 'Work out the mean. ... ', 'Then for each number: subtract the Mean and square the result.']
252050
['Find the mean of the data set.', 'Find the distance from each data point to the mean, and square the result.', 'Find the sum of those values.', 'Divide the sum by the number of data points.', 'Take the square root of that answer.']