## anonymous one year ago Help pretty plz with math on top lol

1. anonymous

2. anonymous

Way out of my grade x.x

3. kyanda17

i think u add all of the colors and find the fraction for her and her friend if i aam right it is out my grade like way out but i tried

4. anonymous

Find the probability of selecting a blue pencil first. Then the probability of selecting a red pencil. For the second selection, there's one less in the bag, so the denominator will be decreased by 1. Multiply the individual probabilities to get the final $P(blue~1st,~red~2nd)=\frac{ no.~of ~blue~pencils }{ total~no.~of~pencils } \times \frac{ no.~of~red~pencils }{ total~no.~of~pencils-1}$

5. anonymous

so the denominator is 127 but decreased makes 126 right

6. anonymous

original denominator is 24+15+8.

7. anonymous

lol my bad 51 but decreased make's it 50

8. anonymous

24+15+8=47

9. anonymous

ooh sorry put my numbers in the calculator wrong lol so when its decreased makes 46

10. anonymous

right

11. anonymous

so 24 / 46 simplify right

12. anonymous

24/46 will be the probability for the 2nd selection. You don't really have to simplify it because they want a percent. You still need the probability for the 1st selection. P = blue/original total

13. anonymous

Ok im confused so 15/46

14. anonymous

15/47

15. anonymous

what's happening is she's selecting a blue pencil first when there are 47 pencils in the bag and 15 of them are blue. So the probability is 15/47. Then she's selecting a red pencil, but now there are only 46 in the bag and 24 of them are red. This probability is 24/46. To find the probability of doing both, you have to multiply the individual probabilities. $P(blue~then~red)=\frac{ 15 }{ 47 }\times \frac{ 24 }{ 46 }$

16. anonymous

ok then i have tha percent ???

17. anonymous

yes

18. anonymous

thank u hope i got it tho

19. anonymous

what did you get?

20. anonymous

why did i get 180

21. anonymous

I don't know. You should have gotten a decimal. try it this way $\frac{ 15*24 }{ 46*47 }$ Multiply the 15 and 24. Then multiply 46 and 47. Post the fraction you get

22. anonymous

180/1081

23. anonymous

then just divide that to get the decimal. Multiply the decimal by 100 to get the percent

24. anonymous

ok

25. anonymous

thats hard

26. anonymous

why i get this long number

27. anonymous

because it's a really ugly fraction and the numbers just don't divide nicely. That's why they said round it to the nearest 10th

28. anonymous

Im not that good with stuff like that

29. anonymous

what did you get? put the first 4 digits up

30. anonymous

0.166

31. anonymous

32. anonymous

Ohhh so thats tha percent

33. anonymous

yes

34. anonymous

Thank u boy or girl i dont know but thx so much this been a horrible week

35. anonymous

you're welcome