1) There is a jar containing 100 marbles: 40 of the marbles are red, 30 are blue, 20 are white, and 10 are black. You are blindfolded and select one marble at random.

a) What is the probability that the marble is black?

b) What is the probability that the marble is black if you are told the marble is not red?

A. The probability that you would select a black marble is 10/100. Which is also 1/10.
B. It would be 10/60. Which is 1/6.

For the first you count how many black marbles are in the jar total? There is 10. Which means 10/100.

For the second the red marbles doesn’t count so now we have only 60 marbles in the jar. 10 of those marbles are still black.

Please vote my answer brainliest! Thanks.