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A commuter must pass through 5 traffic lights on her way to work and will have to stop at each one that is red. She estimates
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Solution:

X.(X) P(X) 0.06 0.25 X.p(x) 0.0.06 = 0 1.0.25 = 0.25 0.35 2.0.35 = 0.7 02.0.06 = 0 12.0.25 = 0.25 22.0.35 = 1.4 32.0.14 = 1.2

Therefore, the population mean is calculated as follows: H = = -1 Xip(X) 0.0.06 +1.0.25 +2.0.35 +3.0.14+4-0.15 +5.0.05 = 2.22

Therefore, we first compute the expected value of X: E(X) = Di-1 X{p(X;) = 02.0.06 + 12.0.25 +22.0.35 + 320.14+ 42.0.15 +52.0

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