AP Statistics Quiz
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PROBABILITY, RANDOM VARIABLES, AND PROBABILITY DISTRIBUTIONS
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In a school cafeteria, let XX be the number of minutes a randomly selected student waits in the lunch line on Monday, with mean μX=8\mu_X=8 and standard deviation σX=2\sigma_X=2. Let YY be the number of minutes a randomly selected student waits in the lunch line on Tuesday, with mean μY=10\mu_Y=10 and standard deviation σY=3\sigma_Y=3. Assume XX and YY are independent. Define the combined variable T=X+YT=X+Y as the total waiting time over the two days. Which statement about the combined variable is correct?
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