A box contains 5 red balls, 3 blue balls and 1 black balls. Take two balls out randomly. Let X be number of red balls and Y be t
he number of black balls. (1) Find the joint distribution of (X; Y ). (2) Find P(X = 1jY = 1).
1 answer:
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Answer:
<em>The correct option is : C. 3.4</em>
Step-by-step explanation:
The probability that a person shopping at a certain store will spend less than $20 is 0.2
That means, here
Given that, the sample size
So, the Mean
Thus, the mean number who spend less than $20 will be 3.4