12.A dental researcher measured the percent calcium content of 6 healthy teeth and recorded the following values: 33.4, 36.2, 33.4, 34.8, 35.2, 35.5.

Another dental researcher measured the percent calcium content of 18 healthy teeth and calculated a sample standard deviation of 2.50. What is the sample variance?

a.0.14

b.0.59

c.1.58

d.6.25

e.Cannot be determined without knowing the 18 values