A company has developed an “easy-start” mower that cranks the engine with the push of a button. The company claims that the probability the mower will start on any push of the button is 0.9. Assume for now that this claim is true. On the next 30 uses of the mower, let T = the number of times it starts on the first push of the button. Here is a histogram of the probability distribution of T:

a. What probability distribution does T have? Justify your answer.

b. Describe the shape of the probability distribution.

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0.25 0.20 0.15 0.10 0.05 0.00 5 10 15 20 25 30 R = Number of passengers who get a red light Probability