On her drive to work Stella has to go through four sets of traffic lights. She estimates that for each set the probability of her finding them red is and green (She ignores the possibility of them being amber.) Stella also estimates that when a set of lights is red she is delayed by one minute. 3 li) Find the probability of: (a] 0 (b) 1 (c) 2 (d) 3 sets of lights being against her. lii) Find the expected extra journey time due to waiting at lights. 5

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A:

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