Mark flips a coin twice. How many outcomes are in the sample space?

HH

TT
HT
TH

To determine the number of outcomes in the sample space, we can use the multiplication principle.

When flipping a coin twice, there are two possible outcomes for each flip - heads (H) or tails (T).

Using the multiplication principle, we multiply the number of outcomes for each flip together. So, for each flip, there are 2 possible outcomes:

2 outcomes for the 1st flip x 2 outcomes for the 2nd flip = 4 outcomes in the sample space

Therefore, there are 4 outcomes in the sample space for Mark flipping a coin twice.