Question

There are 120 students surveyed (30 from each grade). Use the table below to determine that probability that a student selected at random is in 11th grade or selected Math as their favorite subject?

Find P (11th or math)
a. 7/120
b. 1/2
c. 67/120
d. 59/120

Answer 1

I think the answer would be D.
There is 30 students from each grade so we have 30/120 already then add 12 from 9th grade math and add 10 more from 10th grade math, then add 7 from 12th grade math.
30 + 12 + 10 + 7 = 59
59/120 students.

Answer 2

Answer: 59/120 (choice D)

Add up the values in the "math" column and the "11th" row to find the total number of people who are either in 11th grade, in math, or in both.

So,

(12+10+8+7) + (14+5+3) = 59

represents the number of people who are in either category. This is out of 120 (given). This is where 59/120 comes from.