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It means thousand. So if someone said their salary is 200k then they mean 200 thousand.
place value means like the tens place, the hundreds place, the thousands place, the hundred thousands place, and there is also a decimal place value chart but that is another question someone may WANT to improve it!
The mean is the average value and the standard deviation is the variation from the mean value.
Residual point
For a population the mean and the expected value are just two names for the same thing. For a sample the mean is the same as the average and no expected value exists.