Question

If Miranda flips a coin twice, what is the probability that both coins will land heads up?

The probability that the first coin will land heads up is .
The probability that the second coin will land heads up is .
The probability that both coins will land heads up is .

Answer 1

Both heads: ¼

Explanation:

First lands heads up: ½

Second lands heads up: ½

Both heads: ½ × ½ = ¼

Answer 2

The probability that both coins will land heads up is 1/4. The probabilty the first coin will land heads up is 1/2. The probability that the second coin will land heads up is 1/2.

P(both land heads up) = (1/2)(1/2) = 1/4.