Solve for x. −46 x=25

Mathematics

1 answer:

kvv77 [185]3 years ago

5 0

-46 + x = 25
x = 25 + 46 = 71

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A box contains 5 red and 5 blue marbles. Two marbles are withdrawn randomly. If they are the same color, then you win $1.10; if

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a) The expected value is $\frac{-1}{15}$

b) The variance is $\frac{49}{45}$

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We can assume that both marbles are withdrawn at the same time. We will define the probability as follows

#events of interest/total number of events.

We have 10 marbles in total. The number of different ways in which we can withdrawn 2 marbles out of 10 is $\binom{10}{2}$ .

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Consider the case in which we choose one of each color. Then, out of 5 we pick 1. So, the total number of ways in which we pick 1 of each color is $\binom{5}{1}\cdot \binom{5}{1}$ . So, we define the following probabilities.