Each year the Miller county country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated. Rounds1234Number of players left6432168What is the decay rate?

Each round leaves half as many players as the previous round: 128 becomes 64, then 32, 16, and 8. The decay factor is 0.50, meaning 50% of the players remain each round (so 50% are eliminated). The correct choice is 0.50.

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