Based on many years of experience a lecturer in ECON241 has determined that the probability distribution function of X the number of students absent in the Tuesday morning lecture is as follows: 0 0.01 10 0.03 20 0.26 30 0.34 40 0.22 50 0.08 60 0.04 70 0.02 1. Find the probability that on a given Tuesday either 20 30 or 40 students will be absent. (2 dp) 2. Find the probability that on a given Tuesday more than 30 students will be absent. (2 dp) 3. Compute the expected value of X (2dp) 4. Compute the variance of X (2dp) 5. Compute the expected value of Y = 7X+30 (2dp) 6. Compute the variance of Y = 7X+30 (2dp)

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# Based on many years of experience a lecturer in ECON241

Monday July 25, 2022

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