Answer: 0.9
Step-by-step explanation:
For any event A , the probability of event A will occur be P(A).
Then , the probability of not occuring the event A will be given by :-
[tex]\text{P(A')=1-P(A)}[/tex]
The given statement : The probability that an event will occur is 0.1.
That is , [tex]P(A)=0.1[/tex]
Now, the probability that the event will NOT occur is given by :-
[tex]\text{P(A')}=1-0.1\\\\\Rightarrow\ \text{P(A')}=0.9[/tex]
Hence, the probability that the event will NOT occur = 0.9
