Probability

Question 1

probability(event)

Answer 1

matching outcomes/total possible outcomes

Question 2

8 possible outcomes

Answer 2

HHH
HTH
HTT
HHT
TTT
THT
TTH
THH

Question 3

The probability of getting a 6 on an unfair die is 0.3, i throw the die 200 times how many sixes might you expect to get?

Answer 3

60 times- 0.3(200)

Question 4

Theoretical probability definition?

Answer 4

When you know the underlying probability of an event

eg. for a fair die we know each outcomes probability is a sixth

Question 5

Experimental probability definition?

Answer 5

Also known as the relative frequency, based on observing counts.

Question 6

I spin a spinner 120 times and see the following counts.
a-30
b-45
c-45
What is the relative frequency of B?

Answer 6

45/120=0.375

Question 7

The table shows the probability of each outcomes an unfair four sided spinner
1-0.5
2-0.2
3-x
4-2x
I spin another 200 times. How many times would u expect to see a 4?

Answer 7

0.2(200)=40

Question 8

I spin 2 3 sided spinners each with the numbers 1,2 and 3 on them.i multiply the numbers from the 2 spinners
1 2 3
1 1 2 3
2 2 4 6
3 3 6 9
Use your sample space diagram to calculate the probability that the product of the two numbers is prime?

Answer 8

4/9