The formula for the standard deviation of a sample is:

Select the true statement for the following data set that has a meanof 8:

4, 6, 6, 6, 9, 9, 12, 12

Answer choices are rounded to the hundredths place.

• The variance is 7.50 and the standard deviation is 2.98.
• The variance is 2.98 and the standard deviation is 8.86.
• The variance is 8.86 and the standard deviation is 7.50.
• The variance is 8.86 and the standard deviation is 2.98.