Mr.Roy needs two students to help him with a science demonstration for his class of 18 girls and 12 boys. He randomly chooses one student who comes to the front of the room. He then chooses a second student from those still seated. What is the probability that both students chosen are girls? Answer the prob value for 3 decimal places.

Question

Mr.Roy needs two students to help him with a science demonstration for his class of 18 girls and 12 boys. He randomly chooses one student who comes to the front of the room. He then chooses a second student from those still seated. What is the probability that both students chosen are girls? Answer the prob value for 3 decimal places.

.36

.372

.352

None of the above

Answer 1

prob = (18/30)(17/29)

= 51/145
= appr .352

Answer 2

Thank you so much !

Answer 3

To find the probability that both students chosen are girls, we need to determine the total number of possible outcomes and the number of favorable outcomes.

Total number of possible outcomes: Since Mr. Roy randomly chooses the first student, there are 30 possible outcomes (18 girls + 12 boys).

Number of favorable outcomes: After Mr. Roy chooses the first student, there are 29 students remaining, of which 17 are girls. Therefore, there are 17 favorable outcomes (17 girls + 12 boys - 1 girl who was already chosen).

Now, we can calculate the probability:

Probability = Number of favorable outcomes / Total number of possible outcomes
Probability = 17 / 30

Calculating this fraction, we find that the probability is approximately 0.567.

Therefore, the correct answer from the given options is "None of the above" since none of them correspond to 0.567.

prob = (18/30)(17/29)

Thank you so much !

thanks

To find the probability that both students chosen are girls, we need to determine the total number of possible outcomes and the number of favorable outcomes.