discrete probablity exam

# discrete probablity exam - 0.27 0.81 4 0.07 0.28 1.12 5...

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1.  Determine whether a probability distribution is given, if not state so.   If so, determine the  mean, variance, and standard deviation. a. In the following table x represents the number of children in a family under the age of 18. X P(x) 0 0.48 1 0.21 2 0.19 3 0.12 X P(x) X*P(x) X*X*P( x) 0 0.48 0 0 1 0.21 0.21 0.21 2 0.19 0.38 0.76 3 0.12 0.36 1.08 Sum 1 E(x) 0.95 V(x) 0.1775 Sd 0.421307 b. In the following table, x represents the number of credit cards adults have. X P(x) 0 0.26 1 0.16 2 0.12 3 0.09 4 0.07 5 0.09 6 0.07 7 0.14 X P(x) X*P(x) X*X*P( x) 0 0.26 0 0 1 0.16 0.16 0.16 2 0.12 0.24 0.48 3 0.09

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Unformatted text preview: 0.27 0.81 4 0.07 0.28 1.12 5 0.09 0.45 2.25 6 0.07 0.42 2.52 7 0.14 0.98 6.86 Sum 1 14.2 E(x) 2.8 V(x) 6.36 Sd 2.521904 c. In the following table, x represents the number of long-distance telephone calls made during one hour in a telemarketing department. X P(x) 0.32 1 0.08 2 0.12 3 0.09 4 0.07 5 0.06 6 0.04 X P(x) 0.32 1 0.08 2 0.12 3 0.09 4 0.07 5 0.06 6 0.04 Sum 0.78 Sum of probabilities are not equal to 1. Then, this is not a probability distribution....
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## This note was uploaded on 01/31/2012 for the course QM 2113 taught by Professor Kent during the Fall '11 term at ASU.

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discrete probablity exam - 0.27 0.81 4 0.07 0.28 1.12 5...

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