You pictured a model of the situation. You assumed that each letter had an equal chance of being drawn. What should happen or what is expected to happen determines theoretical probability. Real-world situations are much more complicated. A better way to find the probability of real-world events is experimental probability.
Experimental probability is based on observed outcomes, in other words, what actually happens.
Upon completion, construct a class graph of all data on overhead using graph paper transparency. Students will complete worksheet, Vowels 'R' Us . The teacher will circulate and offer assistance, if needed. The assignment will be graded later. Clarify any misconceptions.