Posted by **Lisa** on Sunday, September 29, 2013 at 7:27pm.

1. In a certain game, the probability of getting a red outcome is 0.03. Find the probability of getting an outcome that is not red? The answer must be in a decimal.

I put 0.97 as the answer ( 1-0.03=0.97)

2. The instructor in a Humanities class says that students have a 15% probability of making an A in her class, 20% probabilty of making a B, 25% chance of making a C, and 20% chance of making a D. The possible grades that can be assigned are A, B, C, D, and F. What is the probability that a student does not make an A?

A) 50%

B) 70%

C) 85%

D) Cannot be determined from the information given.

3. The instructor in a Humanities class says that students have a 15% probability of making an A in her class, 20% probabilty of making a B, 25% chance of making a C, and 20% chance of making a D . The possible grades that can be assigned are A, B, C, D, and F.

What is the probability that a student does not make an A or a B?

A) 35%

B) 65%

C) 3%

D) Cannot be determined from the information given.

E) 20%

F) 15%

4. The instructor in a Humanities class says that students have a 15% probability of making an A in her class, 20% probabilty of making a B, 25% chance of making a C, and 20% chance of making a D. The possible grades that can be assigned are A, B, C, D, and F.

What is the probability of a grade more than a C?

A) 60%

B) 20%

C) 35%

D) Cannot be determined from the information given.

E) 40%

F) 65%

I don't know how to answer or set up problems 2-4...

- Statistics -
**Reiny**, Sunday, September 29, 2013 at 8:45pm
your #1 is correct

#2. if prob(making A) = 15%

then prob(not making A) = 100%-15% = 85%

#3. to make A or B = 15% + 20% = 35%

(since A and B are independent events, that is, you can't make both an A and a B), we can just add them up

so prob(not making A or B) = 100-35 or 65%

#4 more than C --- > either A or B which is 35%

- Statistics -
**Lisa**, Sunday, September 29, 2013 at 10:49pm
Thank you!

## Answer This Question

## Related Questions

- Math - A marble is drawn from a bag containing four white, three red, and two ...
- Math - Flip a fair coin 9 times. Find the probability of getting the following ...
- statistics - Use the list and calculation method to answer the following ...
- Probability - A card is drawn from a standard deck of cards. Find P(A U B) in ...
- MS.SUE DAMON REED PSYDAG PLZ HELP ON MATH PLZZZ!!! - 1. The table shows the ...
- Probability -- Help? - Sampling one at a time with replacement from a bag with 8...
- PLZ HELP MT MIND WILL EXPLODE I DONT UNDERSTAND!!! - 1. The table shows the ...
- Statistics - a)One game in a state lottery requires you to pick 1 heart, 1 club...
- Probability - A fair, 6-sided die is rolled 6 times independently. Assume that ...
- Math i dont understand - 1. The table shows the results of spinning a four-...

More Related Questions