One hundred teachers attended a seminar on mathematical problem solving. The attitudes of a representative sample of 12 of the teachers were measured before and after the seminar. A positive number for change in attitude indicates that a teacher's attitude toward math became more positive. The 12 change scores are as follows:

2; 8; -1; 2; 0; 5; -5; 1; 6; 4; -2

A.) What is the mean change score? Round your answer to two decimal places

x=________

B.) What is the standard deviation for this sample? Round your answer to two decimal places.

s=__________

C.) What is the median change score?

D.) Find the change score that is 2.2 standard deviations below the mean. Round your answer to two decimal places.