Question #b1305

1 Answer
Jan 30, 2017

They are independent.

Explanation:

Gigi has 8 coins total, 3 quarters and 5 pennies.

The chance of her pulling out a quarter is 3/8, or 37.5%.

Now, she has 7 coins, 2 quarters and 5 pennies.

However, she puts the missing quarter back in, returning the sample size to the original, before performing the exact same procedure (pulling out a coin).

The new coin has 3/8 chance of being a quarter, and 5/8 chance to be a penny.

Therefore, the fact that the first coin she pulled out was a quarter didn't matter, since she put it back, and the new sample size and chances are the same.