What is the standard deviation for the data set? 212, 249, 212, 248, 239, 212, 216, 234, 248 express your answer as a decimal to the nearest tenth. enter your answer in the box.

The standard deviation of the given data set is:  σ=15.8954920234 or 15.90

212, 249, 212, 248, 239, 212, 216, 234, 248

1) Get the mean. Add up all data and divide it by its count.
2070 / 9 = 230 mean

2) Deduct the mean from each data and square the difference.
3) Get the sum of all the differences and divide it by its count to get the variance.
2274 / 9 = 252.67 variance

4) Get the square root of the variance and it is the standard deviation.
√252.67 = 15.89 or 15.90