# Help With Introduction to Probability Questions

• Dec 23rd 2012, 01:39 PM
dataman22
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 https://www.virtualhighschool.com/co...G8Y5s5yFPIfL7w, 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 https://www.virtualhighschool.com/co...G8Y5s5yFPIfL7w.

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

Thanks
• Dec 23rd 2012, 02:12 PM
Plato
Re: Help With Introduction to Probability Questions
Quote:

Originally Posted by dataman22

Why don't you feel free to show effort on any or all of the questions?
• Dec 23rd 2012, 02:13 PM
zhandele
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?