Aguidance counselor reports that in a given semester, the probability that a student chooses art as an elective is 15 percent, the probability that a student chooses art or drama is 20 percent, and the probability that a student chooses both art and drama is 2 percent.
what is the probability that a student chooses drama as an elective?
5 percent
7 percent
33 percent
37 percent

consider such events:

a - a student chooses art as an elective: pr(a)=0.15 (15 %)

b - a student chooses drama: pr (

- a student chooses art or drama: (20%)

- a student chooses art and drama: (2%)

use formula:

.

substitute all probabilities into given formula:

.

in percent pr(b)=0.07 is 7%.

answer: correct choice is b

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)