All Notations
On a 6-sided die, what is the probability of rolling an even number?
1/2
50%
0.5
If a spinner has 4 colours (red, green, blue and yellow), what is the probability of the spinner landing on green?
25%
0.25
1/4
A six-sided die is tossed. What is the probability of obtaining a number greater than 4?
2/6
1/3
You have 5 purple lollipops, 6 blue lollipops, 7 yellow lollipops and 7 green lollipops. What is the probability of picking a yellow lollipop?
0.28
What is the probability of pulling a spade from a deck of cards (the deck does not include the jokers)
25%
I have a bag of 38 different colored balls, and every time I pick a ball out, I don't put it back in. I need to pick out two different colored balls. What is the theoretical probability that I pick out a red ball twice in a roll?
0
0%
You are one of 30 people who entered a draw to win a car. What is the probability that your name will be drawn first?
Answer: Fractional notation
1/30
A spinner has 5 equal sections labelled 1,2,3,4 and 5. What is the probability of landing on 1 or 2?
Give me the answer as a fraction AND decimal, AND percentage
2/5
0.4
40%
If a bag has 1000 candies, and you have a 0.4 chance of picking a strawberry-flavoured candy. How many strawberry-flavoured candies are in the bag?
400
A coin was tossed 50 times, and it landed on tails 5 times. Write the probability of getting a tail as a percentage.
10% (5/50 = 10/100)
For a project in art class, you must chose one of the following paper colours:
- red, green, blue, yellow
Then you must choose the colour of your marker:
- red, green, yellow, black, pink, orange
How many different combinations of paper and marker are possible?
24
A jar contains 10 red marbles, 12 blue marbles and 2 yellow marbles. All the marbles are congruent and have the same mass. What is the probability of drawing a red marble from the jar?
10/24
5/12
Donato's little brother Joseph is too small to see inside his sock drawer. Joseph has 2 pairs of white socks, 4 pairs of black socks, and 1 pair of blue socks inside the drawer. If the socks are not paired together (loose in the drawer), what is the probability that Joseph will reach inside his drawer and pick a black sock?
4/7
8/14
Laval Junior Academy is hosting an event for all 1,000 students, with mandatory attendance. Out of all the students, 1/2 of them don't play sports, 1/8 of them play hockey, and 75 students play basketball. The rest of them play soccer. LJA must draw a name at the event for a student to win a prize. What is the probability that LJA picks a soccer player, AND how many students play soccer?
0.3
300 students
Are the following certain, impossible, likely, just as likely or unlikely?
1. The forecast says there is a 90% chance of rain tomorrow. What is the likelihood that it will rain?
2. What is the likelihood of rolling a 7 on a six-sided die?
3. If you flip a coin, what is the likelihood you land on heads?
4. In a standard deck of cards (without jokers), what is the likelihood of drawing a king?
5. What is the likelihood of finding a unicorn in your backyard?
6. What is the likelihood that the month after February is March?
1. Likely
2. Impossible
3. Just as likely
4. Unlikely
5. Impossible
6. Certain
Are the following events impossible, certain, or just as likely:
1. The month after June will be February
2. You will get an odd number when you roll a single die.
3. The year after 2030 will be 2028
4. When you flip a coin, it will land on tails
5. The day after Saturday will be Sunday
1. Impossible
2. Just as likely
3. Impossible
4. Just as likely
5. Certain
A bag has 240 marbles, and each marble is either red, blue or green. You have a 1/3 chance of picking a blue marble. and a 50% of picking a red marble. How many green marbles does the bag have, AND what is the probability of picking a green marble?
The bag has 40 white marbles
AND
4/24 or 40/240 or about 17% or 0.1666
A bag has 108 marbles: 27 are red, 36 are blue, and 45 are green. What is the probability of not picking a green marble?
63/108
Abby had 100 marbles, but then Maria decided to steal 60 of them. Caroline came along and stole 40 of Maria's marbles. Maria now has a 0.5 chance of picking red marbles and a 0.25 chance of picking green marbles. The rest of her marbles were blue. What is the probability that she picks a blue marble?
AND how many blue marbles are there?
0.25
and
5 blue marbles
A bag has 8 red marbles, 6 blue marbles and 6 green marbles. What is the probability of picking a red marble?
Give your answer in Decimal AND Percentage
0.4 and 40%
What is the formula for theoretical probability?
Theoretical probability = number of desired outcomes/total possible outcomrd
Lisa is ordering her lunch from the cafeteria and has decided to choose sandwiches. She must decide on the type of bread, the vegetable and the protein (meat).
1. Whole wheat bread OR 7-grain
2. Lettuce OR Tomato
3. Tuna OR Ham
How many different sandwich combinations does Lisa have to choose from? AND How many combinations involve Tuna?
8 combinations
4/8 or 1/2 or 50% or 0.5 have Tuna
A bag has 5 red marbles, 3 blue marbles and 2 green marbles. What is the probability that you pick a red marble?
THEN
You pick the marble out, and it is red. You don't put it back in, and go pick a second marble. What is the probability that your second pick is also red?
1st pick: 5/10
2nd pick: 4/9
A bag has 12 candies. You have a 0.25 probability of picking a chocolate. How many chocolates are in the bag?
0.25 = 1/4, so 1/4 of 12 is = 3 chocolates
A bag has 20 marbles. You know that 40% are red, and 1/4 are blue. How many are green?
7