Probability

zee-f · 2011-08-29 01:50:21

Rita rolled a die 25 times. Her results are shown in the table below:

8. How many sixes did she roll?

8. 25-18=7
she rolled 7 sixes

9. What is P(2)?

9. p(2)= 4/6

10. What is P(4)?

10-p(4)=5/6

11. What is the probability that she rolled a 2 or a 3?

11-1/6

12. What is the experimental probability of rolling an even number, according to Rita's data?

12-3/6= 1/2

13. What is the theoretical probability of rolling an even number?

13- 1/2

14. Find the experimental probability of rolling a 1, 2, 3, 4, 5, or 6.

14-P(1)=6/25
p(2)=4/25
p(3)=1/25
p(4)=5/25
p(5)=2/25
p(6)=7/25

15. Find the theoretical probability of rolling a 1, 2, 3, 4, 5, or 6.

15- (6(1/6)=1)

bobbym · 2011-08-29 01:54:18

Hi;

Number 9 is incorrect.

zee-f · 2011-08-29 01:56:07

isnt it spouse to be 1/6

bobbym · 2011-08-29 01:59:14

Yes, that is the theoretical probability. But you are supposed to be using the chart which is an experimental probability.

zee-f · 2011-08-29 02:03:32

ok so p(2)= 4/6 because she got it 4 times when she rolled out of 6

bobbym · 2011-08-29 02:04:53

Nope. It was rolled 4 times out of how many throws?

zee-f · 2011-08-29 02:07:22

oooh yeah forgot the it spouse to be p(2)=4/25

zee-f · 2011-08-29 02:08:22

so 10- p(4)=5/25

bobbym · 2011-08-29 02:10:26

Probability = successes / total number

Please use that formula.

zee-f · 2011-08-29 02:15:01

11. What is the probability that she rolled a 2 or a 3?

11-

so p(2,3)=5/25

bobbym · 2011-08-29 02:20:13

That is correct!

zee-f · 2011-08-29 02:27:23

are these correct ?

12. What is the experimental probability of rolling an even number, according to Rita's data?

12- p(2,4,6)=16/25

13. What is the theoretical probability of rolling an even number?

13- 3/6= 1/2

14. Find the experimental probability of rolling a 1, 2, 3, 4, 5, or 6.

14-P(1)=6/25
p(2)=4/25
p(3)=1/25
p(4)=5/25
p(5)=2/25
p(6)=7/25

15. Find the theoretical probability of rolling a 1, 2, 3, 4, 5, or 6.

15- (6(1/6)=1)

bobbym · 2011-08-29 02:29:13

Hi;

That looks pretty good.

zee-f · 2011-08-29 02:30:40

thanx i have 5 more left lol

bobbym · 2011-08-29 02:31:35

You should be saying, Oh boy, I have 500 more!

zee-f · 2011-08-29 02:33:44

lol no this lesson is kinda fun its not that hard like the other lessons

bobbym · 2011-08-29 02:35:19

Probability is a lot of fun. It is one of my favorite fields.

zee-f · 2011-08-29 02:42:07

For questions 16 20, use the spinner below. Show your work. (Note: The smallest section of the circle is 1/16 of the circle.)

how is it 1/16 and its 6 pieces ???thats confusing any clues

16. What is P(red, yellow, blue)?

16- p(red, yellow, blue)= 3/6

17. What is P(orange, yellow)?

18. P(green, blue, purple)?

19. P(pink)?

20. P(red, orange, yellow, green, blue, purple)?

bobbym · 2011-08-29 02:44:54

The probabilities do not have to be equal. Just as long as they add up to 1.

Is there more to that diagram?

zee-f · 2011-08-29 02:48:21

nope its just this

zee-f · 2011-08-29 02:49:21

so how do i get the probabilities is it like what i did on 16 ?

bobbym · 2011-08-29 02:51:26

Your answer of 3 / 6 for 16 is incorrect.

zee-f · 2011-08-29 02:55:25

so 3/16 ?
this one is confusing

bobbym · 2011-08-29 03:01:56

Hold on before you put answers down. Is blue, orange and yellow the same area?

zee-f · 2011-08-29 03:03:10

yup

Math Is Fun Forum

#76 2011-08-29 01:50:21

Re: Probability

#77 2011-08-29 01:54:18

Re: Probability

#78 2011-08-29 01:56:07

Re: Probability

#79 2011-08-29 01:59:14

Re: Probability

#80 2011-08-29 02:03:32

Re: Probability

#81 2011-08-29 02:04:53

Re: Probability

#82 2011-08-29 02:07:22

Re: Probability

#83 2011-08-29 02:08:22

Re: Probability

#84 2011-08-29 02:10:26

Re: Probability

#85 2011-08-29 02:15:01

Re: Probability

#86 2011-08-29 02:20:13

Re: Probability

#87 2011-08-29 02:27:23

Re: Probability

#88 2011-08-29 02:29:13

Re: Probability

#89 2011-08-29 02:30:40

Re: Probability

#90 2011-08-29 02:31:35

Re: Probability

#91 2011-08-29 02:33:44

Re: Probability

#92 2011-08-29 02:35:19

Re: Probability

#93 2011-08-29 02:42:07

Re: Probability

#94 2011-08-29 02:44:54

Re: Probability

#95 2011-08-29 02:48:21

Re: Probability

#96 2011-08-29 02:49:21

Re: Probability

#97 2011-08-29 02:51:26

Re: Probability

#98 2011-08-29 02:55:25

Re: Probability

#99 2011-08-29 03:01:56

Re: Probability

#100 2011-08-29 03:03:10

Re: Probability

Board footer