Probability Basics
A bag has 4 red, 3 blue, 3 green marbles. Probability of red (fraction)?
2/5
Convert 3/4 to a decimal.
0.75
Probability of rolling an even number on a die
3/6
Heads 18 out of 30 flips. Fraction?
18/30
What is 25% as a fraction?
1/4
Convert 2/5 to decimal.
0.4
Convert 3/4 to percent
75%
Convert 0.6 to a fraction
6/10
Heads 18 out of 30 flips. Decimal?
What is 1/2 as a percent?
50%
Convert 0.4 to percent.
40%
Convert 0.6 to percent.
60%
Probability of rolling less than 3 on a fair number cube.
2/6
Theoretical probability of heads?
1/2
Which is more likely: a number greater than 4 or even?
Which is larger: 1/2 or 0.25?
1/2
Convert 45% to decimal and fraction.
0.45 , 45/100
Probability of a heart from deck.
1/4
Why do experimental results differ?
random variations
Explain why rolling a number greater than 4 is less likely.
There are fewer outcomes (2 vs 3)
Order: 0.25, 75%, 10%, 1/2
10%, 0.25, 1/2, 75%
Convert 45% into a decimal and a percent.
0.45, 45/100
A jar has:
3 green marbles
7 red marbles
5 blue marbles
What is the probability of picking a red marble?
7/15
What happens with more trials?
closer to theoretical
A jar has:
3 green marbles
7 red marbles
5 blue marbles
What is the probability of NOT picking a green marble?
12/15