Let X = the score out of 3 points on a randomly selected pop quiz in a statistics class. The table gives the probability distribution of X. Value 0123 Probability 0.11 0.25 0.39 0.25
Calculate and interpret the expected value of X.
a. The average score will be about 1.78.
b. It a test is randomly selected, the average score will be about 1.78.
c. If many, many tests are randomly selected, their average score will be about 1.78.
d. None of these is correct.

When y’all answer can y’all explain too !

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.

Plzzz answer both questions and i will give you 100 points