(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

fair coin is flipped 5 times

what is the probability that there will be at most 4 heads?

What is the expected number of heads?

What is the standard deviation for number of heads?

I have no idea how to approach this question because I am unsure of what formulas need to be used :(

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Probability question

**Physics Forums | Science Articles, Homework Help, Discussion**