Sample space (S) = {1,2, 3, 4, 5, 6, 7, 8} 

∴ n(S) = 8 

i. Let A be the event that the spinning arrow comes to rest at 8.

∴ A = {8}

∴ n(A) = 1

∴ P(A) = \(\frac{n(A)}{n(S)}\)

∴ P(A) = 1/8

ii. Let B be the event that the spinning arrow comes to rest at an odd number.

∴ B = {1,3,5,7}

∴ n(B) = 4

∴ P(B) = \(\frac{n(B)}{n(S)}\) = 4/8

∴ P(B) = 1/2

iii. Let C be the event that the spinning arrow comes to rest at a number greater than 2.

∴ C = {3,4,5,6,7,8}

∴ n(C) = 6

∴ P(C) = \(\frac{n(C)}{n(S)}\) = 6/8

∴ P(C) = 3/4

iv.  Let D be the event that the spinning arrow comes to rest at a number less than 9. 

∴ D = {1,2, 3, 4, 5, 6, 7, 8}

∴ n(D) = 8 

∴ P(D) = \(\frac{n(D)}{n(S)}\) = 8/8

∴ P(D) = 1

∴P(A) = 1/8; P(B) = 1/2; P(C) = 3/4; P(D) = 1