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Math

The table below shows the number of marbles of different colors in a box. A fair coin is shown below the table.

Color of Marble Number
Red 10
Blue 1
Green 5
Pink 4

A coin

Dan selects a marble from the box randomly without looking and then tosses the fair coin. What is the probability that Dan will select a blue marble and the coin will land tails up?

1 over 40
3 over 40
11 over 20
19 over 20

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  1. Please help Ms. Sue!

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  2. 20 marbles, 1 blue

    So, P(blue,tails) = 1/20 * 1/2 = 1/40

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