A highschool gym teacher randomly selects a group of two players from three students to demonstrate a basketball drill during class the three students consists of two girls andrea and marta and one boy davi.
The sample space of possible groups is listed below.

Let A be the event that both students the coach chooses are girls and B be the event that the first player is a boy.

What is P(A or B), the probability that the coach chooses all girls or boys first ?

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer: minus2.00, minus1.00, 0, 1.00, 2.00? why? a. the z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores. b. the z score of 0 is most preferable because it corresponds to a test score equal to the mean. c. the z score of minus2.00 is most preferable because it is 2.00 standard deviations below the mean and would correspond to the highest of the five different possible test scores. d. the z score of minus1.00 is most preferable because it is 1.00 standard deviation below the mean and would correspond to an above average