The random variable X represents the number of tests that a patient entering a hospital has. Find the mean and standard deviation for the random variable X from the following probability distribution. x pr(x) 0 0.18 1 0.29 2 0.35 3 0.12 4 0.06 Select one: a.mean: 3.72; standard deviation: 2.52 b.mean: 1.59; standard deviation: 1.10 c.mean: 2.52; standard deviation: 1.93 d.mean: 1.59; standard deviation: 3.72

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