We have a sample space S = {1, 2, 3, 4, 5, 6, 7, 8 ,9, 10}.
Each outcome of this sample space is equally likely.
We have to compute the probability of the event E = 'an odd number less than 9'.
Then, event E happens when one of this outcomes happens: 1, 3, 5 or 7. That is 4 outcomes out of 10.
As all the outcomes are equally likely, the probability of event E will be the quotient between the number of success outcomes (4) and the number of total outcomes (10):
[tex]P(E)=\frac{4}{10}=0.4[/tex]Answer: the probability of event E is P(E) = 0.4.