195,663 views
22 votes
22 votes
What is the probability that Jake's throw will earn at least 30 points?

13.6%
33.5%
36%
73%

What is the probability that Jake's throw will earn at least 30 points? 13.6% 33.5% 36% 73%-example-1
User GuillaumeRZ
by
3.0k points

1 Answer

16 votes
16 votes

Answer:

33.5%

Explanation:

Area of whole dartboard

radius = 3 + (4 x 4) = 19

⇒ area of whole dartboard =
\pi19² = 361
\pi

Area of 30, 40 and 50 points zone

radius = 3 + (2 x 4) = 11

⇒ area of at least 30 points =
\pi11² = 121
\pi

Probability

probability = (121
\pi ÷ 361
\pi) x 100 = 33.5%

User Adam Kinney
by
2.2k points