Question

if P(A) =0.64 then find P(A')?

Answer 1

P(A) + P(A')=1
P(A')=1 - P(A)
P(A')=1 - 0.64
P(A')= 0.36

Answer 2

Hey There,  
This question is concerning the concepts of Probability .
Here, A is an event. A' refers to the complement of the event.  
For example, if Event A = Getting Heads on a Coin Toss

Then Event A' = Not getting Heads = Getting Tails

This makes one thing clear, that

$A \cup A' = U$, where $U$ is the Universal Set.

$P(U) = 1 \\ \implies P(A)+P(A')=1 \\ \implies 0.64+P(A')=1 \\ \implies P(A)=1-0.64 \\ \implies \boxed{P(A')=0.36}$  

Hope this helps   
Purva  
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