Understanding probability is a useful skills. It allows you to make informed choises that are not based on subjective feelings but an understanding of reality.
There are 7 days in a week. Saturday and Sunday are the weekend: 2 days.
So the probability is: 2 out of 7 -> 2/7 ≈ 0.2857 or about 28.6%.
A regular die has numbers 1 to 6. The numbers 3, 4, 5, and 6 are "at least 3" → 4 outcomes.
So the probability is: 4 out of 6 → 4/6 = 2/3 ≈ 66.7%
Let's revise the theory about Probability:
Here's an example of a real life situation where probability is useful.
Sports Strategies
Athletes and coaches use probability to determine the best sports strategies for games and competitions. A baseball coach evaluates a player's batting average when placing him in the lineup. For example, a player with a 200 batting average means he's gotten a base hit two out of every 10 at bats. A player with a 400 batting average is even more likely to get a hit – four base hits out of every 10 at bats. Or, if a high-school football kicker makes nine out of 15 field goal attempts from over 40 yards during the season, he has a 60 percent chance of scoring on his next field goal attempt from that distance. The equation is: 9/15 = 0.60 or 60%
Source
Here's a good website for excercises
