There are many ways to find 3 times 2 times 4
2*3*4
4*2*3
3*4*2
2*4*3
3*2*4
4*3*2
The radius is 10
Circle is centered at Origin (0,0)
a. Your answer is correct.
b. Divide the given value of sigma by √n where n = sample size = 7. Then perform the same calculation you did for part a. The probabiilty is 0.4427.