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January 31, 2015

January 31, 2015

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

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 8:45pmyour #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 10:49pmThank you!

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