Average of faces in things

Imagine that you try to do something and there’s a 20% chance of success. If you try to do the thing six times, what is the probability that you succeed at least once?

In the 1970s, the most common household type in the U.S. was a married couple with kids. Things are different now.

Whether it’s because of experience, physical ability, or education level, some jobs tend towards a certain age of worker more than others.

It seems like no matter what I do, I cannot sleep through the night. Will it ever let up? According to the data, the answer is no and it will only get worse.