Everywhere!
What time is it? That's numerical data. What temperature is it? Numerical data. How many cars pass by a particular road every hour? This is both numerical data and survey data. In an hour, how many people use a vending machine? Survey/ numerical data. Go to a parking lot on a busy day and randomly pick out a parking space. How long does it stay empty for? Survey/ numerical data.
I'm sure you can find many other examples.
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One reason I can think of why you might not be able to find the mean of numerical data would be if there were missing data points.
Numerical data is numbers. Non-numerical data is anything else.
A number that describes numerical data is a Statistic.
Understanding and interpret numerical data
interval data