Okay kiddo, imagine you have a book with a million numbers in it. But instead of those numbers being in any specific order or pattern, they are completely random! That means they don't follow any rules or patterns like 1-2-3 or 5-10-15. They are just a bunch of numbers that have no rhyme or reason.
Now, out of those million random numbers, there are also 100,000 numbers that are considered "normal deviates". That's a fancy term for numbers that have a specific probability of occurring. It's like if you were playing with a toy that had a spinning wheel and it had more red sections than blue sections. There's a higher probability of landing on red than blue, so the red is considered the "normal deviate".
So in this book of one million random numbers, there are 100,000 of them that have a higher probability of occurring. But they are still random, so you never know which ones will come up next! It's like a guessing game where you try to predict what number will come up next, but you never really know for sure.
Overall, this book of a million random digits with 100,000 normal deviates is just a way to study probability and randomness. It's like a big game of chance where you never know what's going to happen next!