One sample has N equals 10 and a variance of S squared equals 20, and a second sample has N equals 15 scores and a variance of a squared equals 30. What can be concluded about the pooled variance of these two samples?

a. it will be closer to 20 than 30

b. it will be closer to 30 than 20

c. it will be excatly halfway between 20 and 30

d. this cannot be determined as we need to know which sample mean is larger