Asked by isadora
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.
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.
Answers
Answered by
Reiny
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 = ...
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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