In a group of 10 people, there are 4 people that have the flu virus. Suppose we pick 3 random persons to test in order to determine if they have the flu and, to simplify our analysis, we suppose that the test is 100% accurate. Let X be the random variable consisting of the number of positive flu tests out of 3.

Tests is 100% Accurate, so by using the formula of random variable probability.

Step-by-step explanation:

Total number of people = 10

Sample space = p(A) = 10

Number of people that have flu = n(s) = 4

Pick random 3 persons, the possibility that they have flue is n(A) = ?

Let X is the random variable, consisting of number of positive flu test,

Tests is 100% Accurate, so by using the formula of random variable probability, we get

  P(X) = n (A) / n(S)

  P(X)      = ¾, is the probability of having positive flu test

b. x + 1

step-by-step explanation:

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