GMAT Quantitative Reasoning - DSQ: Calculating probability

1

A fair coin is tossed a given number of times. What is the probability that three or more of the tosses will come up heads?

The number of times the coin is tossed is four.
The previous day, the coin was tossed ten times, and heads came up eight times.

2

A monster is holding a brown paper bag filled with cookies. Inside the bag there are two types of cookies, chocolate chip and oatmeal raisin. If the monster pulls one cookie out at random, what is the probability that he pulls out a chocolate chip cookie.

1. There are a total of 24 cookies in the bag.

2. There are 8 more chocolate chip cookies in the bag than oatmeal raisin cookies.

3

Find the probability.

Statement 1): Given that the last flips of a coin were heads, the next coin flip is heads.

Statement 2): Given that the last days were sunny skies, the next day is sunny.

4

Jenkins has a box of 36 guitar picks. Each pick is one of three colors: blue, black, or orange.

I) There are 14 more orange picks than blue picks.

II) There are 12 black picks.

What are the odds of randomly selecting a black pick, followed by a blue pick, followed by an orange pick?

5

Choose the answer that best describes sufficient data to solve the problem.

A student body is polled regarding their favorite campus food. Of those who answered "Pizza" half were male and half were female. Pizza received 24 votes from men.

I. Pizza received the votes of 1 out of every 5 men and 3 out of every 10 women.

II. The student population was found to be 60% male and 40% female

How many students altogether were polled?

DSQ: Calculating probability

Practice Questions