Simple Probability
If you flip a coin, what's the probability that you land on heads?
1/2
If you flip two coins, what is the chance they both land on heads?
1/4
If you flip a coin, what's the chance you get heads or tails?
100%
If you roll a dice, what is the probability you land on a 4?
1/6
1/36
If you roll a dice, what is the chance you get a 2 or a 4?
2/6 OR 1/3
If a bag has 3 green marbles, 4 blue marbles, and 3 white marbles, what is the chance of randomly grabbing a blue one?
.4 OR 40% OR 4/10
If Ms. A has a 40% chance of going to the park and Ms. B has a 25% chance of going to the park, what is the chance they both go?
10%
If Alex has a 30% chance of going to the park and Nathalie has a 30% chance of going to the park, what is the chance only one of them goes?
0.51
In a school of 150 people, 60 people take music, 10 people take drama, and 80 people take P.E. What is the chance a randomly selected student is in music?
.4 OR 40% OR 4/10
If 1 in 3 people take drama, and 4 in 6 people take music, what is the chance you take both?
4/18 or 2/9
If I go to the park on 80% of sunny days and 20% of rainy days, and every day is equally likely to be rainy and sunny, what is the chance I go to the park on a given day?
50%
In a group of 200 people, only 7 have red hair, 100 have brown hair, and 93 have blonde hair.
ANSWER IN DECIMALS:
What is the chance of a randomly selected student having red hair?
Blonde?
Brown?
red: 0.035
blonde: 0.465
brown: 0.5
14%
If there's a 20% chance of having blue eyes and a 30% chance of having blonde hair, what's the chance of having blonde hair or blue eyes but not both?
44%