# Thread: Help With Introduction to Probability Questions

1. ## Help With Introduction to Probability Questions

Hey,

I am having trouble with some Intro to Probability questions so I have decided to turn to mathhelpforum.com!

The questions are:

2. A coin is tossed three times. What is the probability of tossing at least one head?
3. A standard die is rolled. What is the probability of rolling a prime number?
4. Use a tree diagram to explain why the probability that a family with four children has either all girls or all boys is , assuming that the probability of having a boy equals the probability of having a girl.
5. If you were to toss four coins what are the odds in favour of 2 heads showing up.
6. Explain why odds of 4 to 5 in favour of an event occurring have a different meaning
than the same event having a probability of .

Please feel free to answer any or all of the questions. Any help would be greatly appreciated!

Thanks

2. ## Re: Help With Introduction to Probability Questions

Originally Posted by dataman22
Please feel free to answer any or all of the questions.
Why don't you feel free to show effort on any or all of the questions?

3. ## Re: Help With Introduction to Probability Questions

Can you explain where you are having difficultly, what about the questions seems difficult? I could just give you the answers, but that might not do you much good.

I'll try a couple hints.

2) If you don't toss any heads, then you must toss three tails. What's the probability that you'll toss three tails? The probability of at least one head must be one minus that.

3) I assume any number (among the six possibilities) is as likely as any other. The possibilities are

1, 2, 3, 4, 5, and 6.

How many of these are prime numbers?