Probability & Statistics

for the variance. It leads to much shorter calculations because the formula uses the quantities and , which can be obtained quickly on a calculator. Example 3. Find the mean and variance of the set of numbers 63, 65, 67, 67, 72, 74, Solution: = 27832. Example 4. It is known that the variance of 5 measurements in ascending order 8, 9, 12, 15, x ... ................
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