Probability of Getting Red/Blue Ball: 60%/40%

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In summary, the probability of selecting a red ball from a box containing 30 blue balls and 20 red balls is 40%, while the probability of selecting a blue ball is 60%. This can also be expressed as a fraction, with a ratio of 2:3 for red to blue balls. The concept of % conventionally represents 1/100.
  • #1
wintbrad
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Homework Statement


You have 30 blue balls and 20 red balls in a box. You select one ball from the box. What is the probability of getting the red ball?, a blue ball?

we can give the answer in percents or fraction(ratio)


Homework Equations



unknown. This is an extra credit thing and we were not given any help.. (ie.. equations, or other examples)

The Attempt at a Solution


Here is what I figure: 60percent of the balls are blue and 40are red.. so that was my answer .

60% chance of a blue and 40%chance of a red.

I am totally unsure on the specific formula to do this. Is my thinking correct?
 
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  • #2
Well, you have been using the "formula" you were supposed to be using.

What do you think a mathematical formula is?
Nothing but the distilled logical relationship between precisely defined quantities.
 
  • #3
thanks for the help...
 
  • #4
What is the definition of % ?
 
  • #5
malawi_glenn said:
What is the definition of % ?
Conventionally, it means 1/100.
 

Related to Probability of Getting Red/Blue Ball: 60%/40%

1. What does a probability of 60%/40% mean in terms of getting a red/blue ball?

A probability of 60%/40% means that out of every 100 balls selected, 60 of them will be red and 40 will be blue.

2. How is the probability of getting a red/blue ball calculated?

The probability is calculated by dividing the number of desired outcomes (red or blue balls) by the total number of possible outcomes (total number of balls).

3. Does the probability of getting a red/blue ball change with each selection?

No, the probability remains the same for each selection since each ball has an equal chance of being selected.

4. Can the probability of getting a red/blue ball be higher or lower than 60%/40%?

Yes, the probability can be higher or lower depending on the number of red and blue balls in the total selection. For example, if there are more red balls than blue balls, the probability of getting a red ball will be higher than 60%.

5. Is the probability of getting a red/blue ball affected by previous selections?

No, the probability remains the same for each selection regardless of previous selections. Each selection is independent of the others.

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