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P(A or B) = P(A)+ P(B)-P(A and B)
here, A = gasoline, B =cigarette

you know all 3, P(A),P(B),P(A and B)
just plug in values!

0.04+0.36-?

40% = 0.4
and P(G and C) is given as % = 0.09

9%

what about P(A and B)

oh I got it

what you got as final answer ?

what about b ?

complete question ?

i got 0.67

is that right?

lets check,
P(G or C) = 0.4+0.36-0.09 = 0.76-0.09 = 0.67
yes, you are correct :)

what about b?

you haven't posted question for b

If we randomly select a customer, what is the probability that she purchases a drink

sorry

can you make a venn diagram for your question ?

can you give me some idea?

|dw:1362261956915:dw|

yes^ from that can you find probability of drink ? just add all the values in D circle.

Makes you wonder what the last 25% are doing. Using the washroom or casing the joint.

0.35?

That looks good to me.

correct :)

awesome

t more quick questions

ok thanks

so, do you find any such pair here ?

G and D are mutually exclusive.

G and D = 12+2 , its not 0

None of the three pairs of events are mutually exclusive.

yeah.

what about the previous one about independent?

for independent , P(A and B) = P(A)*P(B)
so, you need to check this for all 3 pairs.

pg and pd , i got 0.14

how ?

P(G or D)=0.61

Pg is 0.4

14% of customers purchase a gasoline and a drink
Pï¼ˆg and dï¼‰so it;s going to be 0.14

'or' ?? you need to use 'and'

Pï¼ˆg and dï¼‰so it;s going to be 0.14 is correct

so?

G and C we have 0.65

is that = p(g)*p(d) ??

oh no

then G and D are not independent.

0.144?

similar check for other 2 pairs.

why they are not independent?

0.216

so None of the three pairs of events are independent.

yeah

ok last question, i actually got the answer could you help me to check it?

yes?

i got 0.21

correct :)

thank you very much?

welcome?

wait

for this part

answer is not None of the three pairs of events are independent

i didn't calculate for all 3, but looking at numbers, i think its None...

yeah, but its not.

can you help me to check it please?

i still get none :(
lets have a 2nd opinion by @tcarroll010

help me on this one

im not sure, what are independent

Independent means that the occurrence of one does not affect the probability of the other.

Is there just one answer?

in this one, what are independent

yeah, they are multiple choice

Then I guess I would choose G and C

why?

can you explain it?

Because I can't see how one affects the other.

answer is wrong

Do you get another chance?

yes last chance

And you already tried "none"?

yes

So it's a 50-50 chance. Let's see if we can pick out any difference in the two remaining choices.

my queststion is this

cuz , we are not sure

Hey so what did u get in the end? Is it c and d