There is a bag filled with 2 blue, 4 red and 3 green marbles.

Mathematics

1 answer:

Lyrx [107]2 years ago

7 0

Answer:

.753

Step-by-step explanation:

Let Ps = probability both marbles are the same color.

Let Pd = probability both marbles are a different color.

Pd = 1 -Ps

Let Pb = probability both marbles are blue

Let Pr = probability both marbles are red.

Let Pg = probability both marbles are green

Pb= 2/9 * 1/9 = 2/81

Pr= 4/9 * 3/9 = 12/81

Pg=.3/9 * 2/9= 6/81

Ps = Pb + Pr +Pg= 20/81

Pd =1-Ps= 61/81 = .753

Is this correct?

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Step-by-step explanation:

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The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

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___________________________

In order to calculate the expected value we can use the following formula:

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