As level stats venn diagram help

Find p,q,r please

Find p,q,r please

Where was the last place you saw them

Find p,q,r please

You got p right, it's 0.2 coz A is 0.4 in total.

For q you know P(A or B) is 0.7 so everything in both circles must add to 0.7 and you know the total of circle A is 0.4

So q is 0.7-0.4
q=0.3

P=0.2
q=0.3
r=0.2

Does q represent the value of the whole circle
?

Hmm i understand where ur coming from.. But I got 0.3 in my working and then i used that and took it away from the value of p (0.2) and got 0.1 for q...

The reason i took it away was to get the value of q on its own.. Or does q represent the whole circle??

How did you get 0.3?

Also, this formula(in red) is only for mutually exclusive events (circles that are not touching as mutually exclusive means impossible to happen at same time so no overlap)

A and B are not mutually exclusive to each other as there is overlap.
A and C are mutually exclusive.
B and C are mutually exclusive.

So you cannot use that formula for P(A or B) ,

So P(A or b) = p(a) + p(b)
0.7. = 0.4. + p(b)

Hence 0.7 -0.4 = 0.3 for p(b)
Then i did q = 0.3 -0.2 = 0.1

That formula is for mutually exclusive events use
P(A or B) =P(A) +P(B) - P(A intersect B)
if you wanna use a formula

Np

Got another


Got one more question that I need help in.. Mind having a look?

Np

Go on then