Spinner is numbered from 1 through 10 with each number equally likely to occur. What is the probablility

spinner-is-numbered

#1

spinner is numbered from 1 through 10 with each number equally likely to occur. What is the probablility of obtaining a number less than 2 or greater than 7 in a single spin?

Answer:

P(E) = n(E) / n(S)

E = {1, 8, 9, 10} , so n(E) = 4

S = {1,2,3,4,5,6,7,8,9,10} , so n(S) = 10

So P(E) = 4/10 or 0.4