What is the IQ score of a normal person?

Good question, so I'll check around if I can find anyone with an IQ.

Depends on age and remember Standardize test do not accurately measure intelligence rather standardize are a reflection on how well someone takes a test.

The average is 100.

IQ's of 90 to 110 are considered normal.

Discuss this with the psychologist who will be administering the test you plan to take. Do not bother with online tests. They are not valid.

The average IQ was long said to be 100, but it's probably closer to 110 these days.

Zero. Uncommon for the normal person to take the test, more normal to find people never tested.

Would be useful along with aptitude testing to guide someone on a good path for them. 

The valid IQ tests were designed to have an average score of 100. However, I have read that average scores on these tests have risen about 10 points since the tests were first given- there are a lot of possible reasons for that- better nutrition is one, and we know that the right kind of stimulation in the infant years can make a difference. But that's only for valid IQ tests administered by a trained psychologist. The online IQ tests are NOT valid and should not be taken seriously. 

100... but not that simple

https://www.google.com/search?q=What+is+the+IQ+sco...

The current scoring method for all IQ tests is the "deviation IQ". In this method, an IQ score of 100 means that the test-taker's performance on the test is at the median level of performance in the sample of test-takers of about the same age used to norm the test.

https://en.wikipedia.org/wiki/IQ_classification

Zero. Uncommon for the normal person to take the test, more normal to find people never tested.

Would be useful along with aptitude testing to guide someone on a good path for them.