Please help I will give the Brainlest answer . A cross country coach records the number of miles his athletes on the Junior Varsity and Varsity teams ran today and displays the data in the provided dot plots. Given the shape of each distribution, determine which measures of center and spread are appropriate for him to use to summarize the data from each team.

For the first dot plot, the best measure of center to use would be the mean because the data is symetric. If you evened these all out, the mean would be a good measurement because both sides are evenly distributed.  The best measure of variation would be the Mean absolute deviation because you will use the mean to calculate it.

For the second dot plot, the best measure of center would be the median because the data is skewed left.  This means that it is not evenly distributed on both sides for choosing the actual middle number would represent it best.  The interquartile range (the distance from the beginning to the end of the middle half of the data) is the best measure of variation, because it will not account for the data that is skewed.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.