### Home > MC2 > Chapter 11 > Lesson 11.2.2 > Problem11-41

11-41.

For each of the experimental results described, write the indicated probability.

1. A coin is flipped $80$ times. It lands tails $47$ times. What is P(heads)?

How many times did the coin land heads out of the total 80 times?

$\frac{33}{80}$

2. A bag contains purple and orange marbles. Sam randomly takes out one marble then returns it to the bag. He does this $18$ times, and $12$ of those times an orange marble is pulled out. What is P(green)?

How many green marbles are there in the bag?

3. Sarah pulls a card from a standard deck and then replaces it. She does this $30$ times, and $40\%$ of the time it is hearts. What is P(~hearts)? Recall that ~ means "not hearts."

If $40\%$ of the time, it is a heart, the remaining trials must not have been hearts.

$60 \% \text{ or } \frac{18}{30}$