Question

Suppose you randomly select a letter from BURGER AND STARBIRD. Imagine writing these letters on Ping-Pong balls – one letter per ball – then putting them all in a barrel and removing one. What is the probability of pulling out an R? What is the probability of pulling out a B? What is the probability of pulling out a letter that appears in the first half of the alphabet? What is the probability of pulling a vowel?

Answer 1

B U R G E R      =  6 letters
S T A R B I R D =  8 letters
                             14 letters in all

B = 2 ; U = 1 ; R = 4 ; G = 1 ; E = 1 ; S = 1 ; T = 1 ; A = 1 ; I = 1 ; D = 1

Probability of pulling out an R: 4/14
Probability of pulling out a B: 2/14
Probability of pulling out a letter that appears in the first half of the alphabet: 7/14
Probability of pulling a vowel: 4/14