Question

If P(X) = 0.3, P(Y) = 0.9, and P(X and Y) = 0.2, what is P(X or Y)?

A. 0.8
B. 0.9
C. 1
D. 0.4

Answer 1

Answer:

(☞In sets ( obviously the maths chapter)

the meaning of 'or' is union which is denoted by 'U'

so

ok there is formula for it

p(xUy)=p(X)+p(y)+p(x and y)

= 0.3 +.9 +.2

= 1.4

so

p(xUy) = 1.4

◉ in formula the and means intersection

I haven't its sign on my keypad so .....◉

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