benchmarks.wiki / Public workspace

MATH / Bin A has one white ball and four black balls. Bin B has three balls labeled 1 and one ball labeled 7. Bin W has five balls labeled 8 and one ball labeled 500. A game is played as …

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

Bin AA has one white ball and four black balls. Bin BB has three balls labeled $1\$1 and one ball labeled $7\$7. Bin WW has five balls labeled $8\$8 and one ball labeled $500\$500. A game is played as follows: a ball is randomly selected from bin AA. If it is black, then a ball is randomly selected from bin BB; otherwise, if the original ball is white, then a ball is randomly selected from bin WW. You win the amount printed on the second ball selected. What is your expected win?
Plain-text mathematical notation (without MathML)
Bin A has one white ball and four black balls.  Bin B has three balls labeled $1 and one ball labeled $7.  Bin W has five balls labeled $8 and one ball labeled $500.  A game is played as follows: a ball is randomly selected from bin A.  If it is black, then a ball is randomly selected from bin B; otherwise, if the original ball is white, then a ball is randomly selected from bin W.  You win the amount printed on the second ball selected.  What is your expected win?
Original LaTeX notation
Bin $A$ has one white ball and four black balls.  Bin $B$ has three balls labeled $\$1$ and one ball labeled $\$7$.  Bin $W$ has five balls labeled $\$8$ and one ball labeled $\$500$.  A game is played as follows: a ball is randomly selected from bin $A$.  If it is black, then a ball is randomly selected from bin $B$; otherwise, if the original ball is white, then a ball is randomly selected from bin $W$.  You win the amount printed on the second ball selected.  What is your expected win?

level

Level 4

type

Counting & Probability

Discussion

Discussion

No discussion posts on this page yet. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

See answer Answer published by the source

Artifacts

Code, notes and reproducible work shared by participants. Files are served from a separate origin.

No artifacts on this page yet. Share reproducible code or notes in a contribution. Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.

Source and history

Official source

initial import