A box contains 100 colored chips; some are violet and some are red. Wilson chooses a chip at random, records the color, and places it back in the bag. Wilson has recorded 9 violet chips and 16 red chips. Using these results, what is the predicted number of violet chips in the box?

11
25
36
75

Question

A box contains 100 colored chips; some are violet and some are red. Wilson chooses a chip at random, records the color, and places it back in the bag. Wilson has recorded 9 violet chips and 16 red chips. Using these results, what is the predicted number of violet chips in the box?

 11
 25
 36
 75

anonymous · Answer

@mathrulezz @Mashy @HelpBlahBlahBlah

anonymous · Answer

@Howard-Wolowitz @Luigi0210 @Michele_Laino

anonymous · Answer

Anyone have a clue? If you're trying to solve it please tell me

anonymous · Answer

There's 75 left in the bag, so it's not D, 75

anonymous · Answer

ok, well i think its c, personally

anonymous · Answer

What do you think it is @mathrulezz ??

anonymous · Answer

B, 25

anonymous · Answer

set it up as a ratio->
9:16
9*3=27
16*3=48
27+48=75

25 is closest

anonymous · Answer

Oh ok thx :) Sorry for the late response but I was trying to help someone else. Can u help me with some more plz??

anonymous · Answer

np! & yes

anonymous · Answer

A spinner is divided into many sections of equal size. Some sections are red, some are blue, and the remaining are green. The probability of the arrow landing on a section colored red is 12 over 20. The probability of the arrow landing on a section colored blue is 6 over 20. What is the probability of the arrow landing on a green-colored section?

 2 over 20
 6 over 20
 8 over 20
 18 over 20

michele_laino · Answer

please here we have to solve this equation:
$$\frac{{12}}{{20}} + \frac{6}{{20}} + p = 1$$
where p is the requested probability

michele_laino · Answer

hint:
$$p = 1 - \frac{{12}}{{20}} - \frac{6}{{20}} = 1 - \frac{{18}}{{20}}$$

michele_laino · Answer

what is p?

anonymous · Answer

hmm.....

michele_laino · Answer

$$p = 1 - \frac{{12}}{{20}} - \frac{6}{{20}} = 1 - \frac{{18}}{{20}} = ...?$$

anonymous · Answer

ahh!! im confused sorry how do i start??

michele_laino · Answer

the sum of all probabilities has to be equal to 1, so I get this equation:
$$\frac{{12}}{{20}} + \frac{6}{{20}} + p = 1$$

anonymous · Answer

18/20 +p = 1

michele_laino · Answer

yes!

anonymous · Answer

next?

anonymous · Answer

2/20

anonymous · Answer

plug in 2-> 
18/20 + 2/20=1

michele_laino · Answer

next step is:
$$p = 1 - \frac{{18}}{{20}} = ...?$$

anonymous · Answer

2/20 = p!!

anonymous · Answer

right?

anonymous · Answer

@mathrulezz @Michele_Laino

michele_laino · Answer

that's right!

anonymous · Answer

thx:) i have another one ill post in anotheer post

anonymous · Answer

kk :)

michele_laino · Answer

please, wait since I have to go to dinner