Mathematics, 21.04.2020 21:30 shannydouglas

I have 100 pennies in a box. 20 of the pennies were minted in the 1990s, 20 were minted in the 1980s, 40 were minted before the 1980s and the rest were minted in this century.

What is the probability of choosing a penny that was minted in this century?

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I have 100 pennies in a box. 20 of the pennies were minted in the 1990s, 20 were minted in the 1980s...

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I have 100 pennies in a box. 20 of the pennies were minted in the 1990s, 20 were minted in the 1980s, 40 were minted before the 1980s and the rest were minted in this century. What is the probability of choosing a penny that was minted in this century?

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I have 100 pennies in a box. 20 of the pennies were minted in the 1990s, 20 were minted in the 1980s, 40 were minted before the 1980s and the rest were minted in this century.

What is the probability of choosing a penny that was minted in this century?