what is the first error he made in computing the standard deviation?\nyuri failed to find the difference…

what is the first error he made in computing the standard deviation?\nyuri failed to find the difference between each data point and the mean\nyuri divided by n instead of n - 1\nyuri did not subtract 9 - 14 correctly.\nyuri failed to square -2 correctly

what is the first error he made in computing the standard deviation?\nyuri failed to find the difference between each data point and the mean\nyuri divided by n instead of n - 1\nyuri did not subtract 9 - 14 correctly.\nyuri failed to square -2 correctly

Answer

Explanation:

Step1: Recall standard - deviation formula

For a sample, the formula for the standard deviation is $s=\sqrt{\frac{\sum_{i = 1}^{n}(x_{i}-\bar{x})^{2}}{n - 1}}$, where $n$ is the number of data - points, $x_{i}$ are the individual data - points, and $\bar{x}$ is the mean.

Step2: Analyze the given calculation

In the given calculation, the denominator is $n = 4$ instead of $n-1=3$. When calculating the sample standard deviation, we divide by $n - 1$ to get an unbiased estimator.

Answer:

Yun divided by $n$ instead of $n - 1$