Experimentally it landed on tails 5/12 tails/rolls=5/12 so if this continues how many rolls will it take to get 30 tails?
5/12=30/r
5r=12(30)
5r=360
r=72
72 rolls to get 30 tails
The answer is D, there is no bias as Josh used random sampling.
The perimeter is composed of two straight parts and two semicircles. We can use this to break down the problem.
We can find the straight parts easily. They are given in the problem.
straight parts: 82 x 2 = 164 m
The two semicircles make a circle. We just have to find the circumference of a circle with a diameter of 66 cm to get the length of the semicircles.
semicircles: 2(π)(66/2) = 66(3.14) = 207.24 m
answer: 164+207.24 = 371.24 m
