A bag contains 5 gray tiles and 2 blue tiles. Jenny reached into the bag and picked a tile randomly, and then without replacing it, picked a second tile. If you know that she picked a blue tile withher first pick, what is the probability that she picked a gray tile with her second pick?

Question

Rumplestiltskin

Mathematics

5 December, 04:39

A bag contains 5 gray tiles and 2 blue tiles. Jenny reached into the bag and picked a tile randomly, and then without replacing it, picked a second tile. If you know that she picked a blue tile withher first pick, what is the probability that she picked a gray tile with her second pick?

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Answers (1)

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Dodger · Answer 1

Probability = Color asked for divided by total

Pick one:

Total 7 tiles

5 gray, 2 blue

probability of grey = 5/7

probability of blue = 2/7

Pick two

One blue is removed so then you have

total=6

blue=1

gray=5

probability of gray = 5/6