Range 0–10 11–20 21–30 31–40 41–50
number of students 8 12 30 25 15
the table shows the range of scores obtained by 9th grade students on a math test and the number of students in each range. if a student is picked at random, the probability that his or her score is between 21 and 40 is
.

Step by step expontion

The great thing about this problem is they give you everything you need to solve it easily. so the expression is: 12h+30w12h+30wand so everywhere you have an “h” you place 66. and everywhere you have a “w” you place 33. then the expression will look like this: 12(66)+30(33)12(66)+30(33)from here you multiply and then add. getting the following of: $785,862hope this