The mean is a summary statistic that shows where the center of your dataset is. There are several types of mean but the most common is the arithmetic mean which is simply the sum of all the values divided by the number of values.
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It stands for "My Face When", when a picture is shown to show the poster's reaction.
It means that whatever it is is ... as thick as your finger is. This is a comparison to show you something's size.
A confidence interval of x% is an interval such that there is an x% probability that the true population mean lies within the interval.
About as in "There was about 43 flowers in the vase". So it's to show not the exact number but just about, near the right number.
If you have an IQ of 152, it means that you are in the genius level. You are well above average and should work to your best potential to show all of your talents.