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1.) (5 pt.) At a grocery store customers in the checkout line may use a credit card. The probability they will use a credit card is 80%. There are four customers in a line. Let X be the random variable (R.V.) denoting the number of customers out of the four who use a credit card. Determine the probability mass function (pmf) for X and use it to construct both graphically and numerically the cumulative distribution function (CDF) for X. 2.) (2 pt.) Referring to problem construct the interval 41-0, μ + σ).

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math   Statistics-And-Probability   
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Answer #1

Ceus tomes wae o n=4 LAS 0:0212 o 18o 2 0.153( 4o:409 Cr D o. 1808 242 3

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