The formula for the standard deviation of a sample is:

Select the true statement for the following data set that has a mean of6.75:

4, 6, 7, 10

Answer choices are rounded to the hundredths place.

• The variance is 4.71 and the standard deviation is2.17.
• The variance is 6.75 and the standard deviation is6.25.
• The variance is 2.50 and the standard deviation is6.50.
• The variance is 6.25 and the standard deviation is2.50.