Can you help me with this Statistics question?

3.2) Which of the following are statistics, and which are parameters?

(a) The mean height of a sample of basketball players in the National Basketball Association

(b) The mean weight of the population of football player on the Washington Redskins team

(c) The mean blood pressure of the population of patients in the cardiac ward of a hospital

(d) The mean grade of students in a certain elementary algebra section at a college, which is used to estimate the mean grade of all students in all sections of elementary algebra at the college

3.6) According to U.S Energy Information, the state gasoline tax in the Mountain States in cents per gallon in March 1999 was as follows:

State Cents per gallon

Montana 28.0

Idaho 25.0

Wyoming 14.0

Colorado 22.0

New Mexico 19.0

Arizona 18.0

Utah 25.0

Nevada 24.0

Find their mean state tax on gasoline.

3.12) By mistake, an instructor has erased the grade that one of ten students in her class received in a final examination. However, she knows that the students averaged ( had a mean grade of) 71 on the examination, and that the other nine students received grades of 96, 44, 82, 70, 47, 74, 94, 78, and 56. What must have been the grade that the teacher erased?

3.16) Careful measurement show that the actual coffee content of six jars of instant coffee is 6.03, 5.98, 6.04, 6.00, 5.99 and 6.02 ounces of coffee. What would have been the error in the mean coffee content of the six jars if the third value had been recorded incorrectly as 6.40?

3.22) A wholesaler sold 575, 410, and 520 microwave ovens at prices of $75, $125 and $100, respectively. What is the mean price of the ovens sold?