Question

More questions,

A little help would be nice

Determine the sum of the given probabilities. Are the events complementary?


P(A) = 3/7 ; P(B) = 2/7



A.


5/14 The events are complementary.


B.


5/14 The events are not complementary.


C.


5/7 The events are complementary.


D.


5/7 The events are not complementary.

I'm really unsure of what the answer is and I don't have any guess so could someone help me?

Answer 1

First part: "Determine the sum of the given probabilities"

so you just add 2/7 and 3/7 to get ???

Answer 2

5/7

and It's not complementary, right?

Answer 3

correct on both

2/7 + 3/7 = 5/7 and this is NOT equal to 1

complementary events always add to 1. This is like saying "either event A or event B happens. No other outcome is possible"

but the fact that 5/7 isn't 1, there's this leftover bit that leaves room for some other event C

Answer 4

Thank you!

Answer 5

you're welcome