## Monday, October 16, 2006

### Jaymie's E-50 number 2 Questions

2. A spinner is shown at the right for which each outcome is not equally likely.

Part 1

E. If you spin the spinner once, what is the probability that it will stop on A?

A. If you spin the spinner once, what is the probability that it will stop on B?

T. If you spin the spinner 50 times, about how many times would you expect it to stop on A?

Y. If you spin the spinner 80 times, about how many times would you expect it to stop on C?

Part 2

this is the format of writing probability fractions.

E. If you spin the spinner once, what is the probability that it will stop on A?

The probability that it will land on A is 2/4 (2 out of 4) or 1/2 (1 out of 2) or 50% because A is Half of the circle or is 2 /4 of the circle because you have to find the common pieces, which is 4ths. The 2 is the possible outcomes and 4 is the total possible outcomes, using the common piece.

A. If you spin the spinner once, what is the probability that it will stop on B?

The probability that it will stop on B is 1/4 because since the common piece is 4ths, B would be 1/4 of the circle or 25%. The 1 is the total possible outcomes because there is only one B that the spinner can land on and the 4 is the total possible outcomes because there are 4 possible outcomes using the common piece which is 4ths.

T. If you spin the spinner 50 times, about how many times would you expect it to stop on A?
The answer is 25 times because : (p.o.)1/2(2 multiplied by 25 equals 50 ) = 25/50(50 divided by 2 equals 25)
25 would be the number of times you would spin A out of 50 spins.

Y. If you spin the spinner 80 times, about how many times would you expect it to stop on C?
The answer is 20 times because : (p.o.)1/4(4 multiplied by 20 equals 80 ) = 20/80(80 divided by 4 equals 20)
20 would be the number of times you would spin C out of 80 spins.

Part 3

2. A spinner is shown at the right for which each outcome is not equally likely.

1. what is the probability of spinning green and pink? express in fraction and percentage.
2. what is the probability of spinning purple and pink?what do you notice? express in fraction and percentage

1. what is the probability of spinning green and pink? express in fraction and percentage.
answer: The probability of spinning green and pink is 3/4 or 75%.

2. what is the probability of spinning purple and pink?what do you notice? express in fraction and percentage
answer: The probability of spinning purple and pink is 2/4 (1/2) or 50%. I notice that if I Spin purple or pink that it will be a 50 % chance. Now it would be equally likely because now it is a 50, 50 chance.

-Jaymie S. rm 8-17-

amyL said...

lol thx ! you did a good job on your questions too ! (;

boeun said...

jaymie.. i have a question,,
are you sure that P = # p o
------------
# of p o
isn't the bottom have to be total possible outcomes? i forgot now..^^

rivka said...

wow jaymie u're smart! great job hehehehe...