Probability questions?
Two questions:
- Find the probability of answering two multiple choice questions correctly if random guesses are made. Assume the questions each have five choices for the answer.
Only one of the choices is correct.
- Find the probability of answering two true or false questions correctly if random guesses are made.
Only one of the choices is correct.
My issue: I don't know which probability rule to apply here...
Two questions:
- Find the probability of answering two multiple choice questions correctly if random guesses are made. Assume the questions each have five choices for the answer.
Only one of the choices is correct. - Find the probability of answering two true or false questions correctly if random guesses are made.
Only one of the choices is correct.
My issue: I don't know which probability rule to apply here...
1 Answer
First question:
You can reason the situation logically, or you can apply a law.
Probability of an event
If there are
Or you can use the law which says:
"AND" implies multiply.
Second question:
The approach is the same, but there are only 2 options, each question is either "True or False"
Only one combination is correct.