Mrs. rodrigues wants to compare the spread of the test scores of her two biology classes. which statistic should she use? (multiple choice) a.) mean
b.) standard deviation
c.) median
d.) mode

if anybody can help me with this, thank you so much! i'm trying to pass a pre-test on e. d.g. e.n. u.i. t.y :( if you know the answer, please explain instead of just giving me the answer alone. thank you! <3

The host of a game show is holding a bag with chips to see what prizes the contestants will play for. five (5) of the chips say “new car” ten (10) of the chips say “new tv” three (3) of the chips say “trip to france” contestant named “patty” reaches into the bag. a. what is the probability of choosing a tv chip? b. what is the probability of choosing a car chip next without replacing the 1st chip? c. are these dependent or independent events?