Question

What is the probability that Jake's throw will earn at least 30 points?

Answer 1

Answer:

33.5%

Step-by-step explanation:

Area of whole dartboard

radius = 3 + (4 x 4) = 19

⇒ area of whole dartboard = $\pi$19² = 361$\pi$

Area of 30, 40 and 50 points zone

radius = 3 + (2 x 4) = 11

⇒ area of at least 30 points = $\pi$11² = 121$\pi$

Probability

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