Question

how do i solve this ??

A class of 21 students has 9 girls and 12 boys.What is the probability of a teacher
randomly calling on a boy?

A. 3/4
B. 4/7
C. 3/7
D. 4/3

Answer 1

@Destinymasha I missed this question on my study guide and i need to know how to do it but i think its C. from what i did

Answer 2

the answer doesnt really matter now since its a practice test but i need to knwo how to do the ones i missed

Answer 3

@amistre64 i missed this question on my study guide so can u tell me how to complete it?

Answer 4

its just the basic definition of probability. how do we define probability?

Answer 5

@amistre64 i looked it up and it says the extent to which something is probable; the likelihood of something happening or being the case. ??

Answer 6

using numbers: probability is defined as the number of times we want something to happen, divded by the number of times things can happen:

we want to pick a boy, how many boys are there?
there are how many people entotal are there to choose from?

Answer 7

total of 21 students and 12boys

Answer 8

then the probability of randomly picking a boy should be: 12 out of 21 = 12/21

Answer 9

ok thats all to it?

Answer 10

thats all to it for something this fundamental yes :) it gets harder as you go along since real life isnt as simple as this.