Question

http://s296.photobucket.com/user/ontoonex99/media/Screen%20Shot%202015-06-02%20at%207.37.12%20PM_zpseia5o480.png.html

I need help number 18 and 20
please check number 18 did
P(A and B)=P(A) X P(B)
P(A and B) / P(B)= P(A)
= 0.15/0.6
= 1/4 ?

Answer 1

I would say
\[ P(B|A)= \frac{P(A \cap B)}{P(A)} \]
so
\[ P(A)= \frac{P(A \cap B)}{P(B|A)} \]
with P(B|A)= 0.6 and P(A \(\cap\) B) =0.15
from which you get P(A)= 0.25

Answer 2

ok,Thanks, can you do number 20?

Answer 3

For Q20
there are 20 marbles , 9 of them red. so 9/20 chance of choosing a red marble on the first pick. If you put the marble back in, then you will have 9/20 chance of picking red on the second pick, and 9/20 on the third. thus
\[ \left(\frac{9}{20}\right)^3 \]

Answer 4

If you do not replace the marble, then the chance of picking a red marble on the first pick is 9/20, on the second 8/19 and on the third 7/18
thus
\[ \left( \frac{9}{20}\right)\left( \frac{8}{19}\right)\left( \frac{7}{18}\right) \]

Answer 5

for part A, each time you pick is an independent event (because we put the marble back in the bag). That means each pick should be 9/20
and for multiple independent events, you multiply the individual probability to find the probability of all the events occurring.

Answer 6

thanks , can you have me some more ?

Answer 7

http://s296.photobucket.com/user/ontoonex99/media/Screen%20Shot%202015-06-02%20at%207.37.25%20PM_zpsthipwake.png.html

Answer 8

ok

Answer 9

this one I no idea

Answer 10

for event A, you count up the number of tiles that are consonants
(the problem is y is sometimes a vowel e.g. fly, by, dry, or as a consonant e.g.
you, yell, young, ...)

not sure how to handle that.

Answer 11

and of course for B, first count the number of tiles that are vowels.

Answer 12

let me know if later you can solve , I need help if you can check my work it correct

Answer 13

can you check my answer ?

Answer 14

Let's assume y is only a consonant. then there are 42 vowels, 2 blanks, 56 consonants
the chance of choosing a consonant on the first draw is 56/100
and the chance of choosing a vowel on the 2nd draw is 42/99

Answer 15

and we multiply
(56/100)*(42/99)

Answer 16

http://s296.photobucket.com/user/ontoonex99/media/Screen%20Shot%202015-06-02%20at%205.56.17%20PM_zpstctblc9x.png.html

\[\frac{ 1 }{6 }\] \[\frac{ 1 }{ 6 } . of .60 = 10 ?\]

Answer 17

yes, and the 4 spot came up 10 times

Answer 18

ok, next http://i296.photobucket.com/albums/mm168/ontoonex99/Screen%20Shot%202015-06-02%20at%205.56.23%20PM_zpscjpwjnoy.png
\[\frac{ 1 }{ 5 }\times30?\]

Answer 19

yes, so the black marble.

Answer 20

thanks,next http://i296.photobucket.com/albums/mm168/ontoonex99/Screen%20Shot%202015-06-02%20at%205.56.08%20PM_zpszlf9z9b0.png
\[\frac{ 179 }{ 2237 }=0.0800\]
0.0800 x 100= 8% ?

Answer 21

I would leave the answer as 0.08

Answer 22

thanks http://s296.photobucket.com/user/ontoonex99/media/Screen%20Shot%202015-06-02%20at%205.56.29%20PM_zpsfhmscrjx.png.html

\[\frac{ 526 }{ 2392 }?\]

Answer 23

yes

Answer 24

http://i296.photobucket.com/albums/mm168/ontoonex99/Screen%20Shot%202015-06-02%20at%206.19.45%20PM_zpshyvuxfv0.png

\[5<30 <80<90\]

Answer 25

your picture of the weather does not match up with 9/12000

Answer 26

let me check

Answer 27

for the weather question I think they want you to order A , B, C , D from least to most likely

Answer 28

ok,
http://i296.photobucket.com/albums/mm168/ontoonex99/Screen%20Shot%202015-06-02%20at%206.20.56%20PM_zpsldqx0cs1.png

\[\frac{ 9 }{ 12000 }?\]

Answer 29

9/1200 (not 12000)

and expected number of defects is 9/1200 * 15000

Answer 30

\[\frac{ 9 }{ 1200 }\times1500?\]

Answer 31

yes

Answer 32

let go back to number 22
D<B<A<C ?

Answer 33

chance of rain on Fri is 5%, so chance of no rain is 95%
i.e. D has prob= 95%

Answer 34

and they want the order smallest to biggest. D will be the biggest chance.

Answer 35

what numbers do you get for A, B , C and D ?
for A and C, read off the number from the chart
for B and D, do 100 - what is on the chart.

Answer 36

I get A 80, B 70, C 90, D 95

Answer 37

thanks you . Take me so long ti fix out , http://s296.photobucket.com/user/ontoonex99/media/Screen%20Shot%202015-06-02%20at%207.35.09%20PM_zpse2zctvy9.png.html

3) Dependent
4) independent