maths

A bag contains only red, green, brown and yellow marbles.
The probabilities of selecting each colour are shown below.
The probability of choosing a red marble is the same as choosing a yellow marble.

Colour Red Green Brown Yellow
Probability 0.27 0.07
Find the probability of selecting a brown or yellow marble.

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  1. The probabilites must add up to 1

    I will assume your "shown below" is:

    Prob(red) = .27
    prob(green) = .07
    It said prob(yellow) equals prob(red), so prob(yellow) = .27

    then prob(brown) = x
    .27 + .07 + x + .27 = 1
    x = .39

    prob(brown or yellow) = .39 + .27 = ...

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    Reiny

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