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

11-41.
1. For each of the experimental results described, write the indicated probability. Homework Help ✎

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

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)?

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."

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

$\frac{33}{80}$

How many green marbles are there in the bag?

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

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