Consider the following sample. \[ 22,8,21,8,9,11 \] (a) Find the range. \( \square \) 14 \( \checkmark \) (b) Find the variance. (Give your answer correct to two decimal pla \( \square \) \[ 4298 \] (c) Find the standard deviation. (Give your answer correct to two d \( \square \) 6.56
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Beyond the Answer
To get the variance, start by calculating the mean of the sample. The mean is found by summing all the values and dividing by the number of values. This gives you a mean of approximately \(11.67\). Then, calculate each value's deviation from the mean, square it, and average those squared deviations. This results in a variance of approximately \(6.89\), rounded to two decimal places. For the standard deviation, simply take the square root of the variance. Using the variance from above, our standard deviation is about \(2.63\) when rounded to two decimal places. Remember, the standard deviation is a handy measure of how spread out the numbers are in your dataset!
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