Last question! will make brainleist! plz is awsome, your smart, plz ! the stem-and-leaf plot shows the heart rates that two groups had during exercise. how many group 2 subjects had heart rates greater than 143? a) 9 b) 11 c) 12 d) 13

The answer is B) 11.
 reason is because the 'stem' part is the first two digits of the number, so skip all the way to "stem 14" now look at the single numbers on group 2's side,  each number represents the last digit of the whole number, for example, "stem 14, group 2 digit 3" is 143. if you need numbers greater than 11, then you count the numbers after "stem" 14 "group 2" 3 66788355724 dont add or multiply them, just simply count how many numbers there are. 11