The answer depends on a whole list of variables that are not specified. Some of these are:
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The answer depends on where you are searching!
The formula for finding probability depends on the distribution function.
I got no idea
The probability of findinf a job by using a job search is pretty high, especially if you use a more well known job search engine, such as Monster, or Career Builder. I personally know several people who have attained jobs using Career Builder, one of these persons being my mother. These websites let you upload a resume and maintain an account with them to make things easier for you as well.
None, if you do not have the necessary qualifications.