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when a value is rounded to one decimal place, it means that there is only one number after the decimal point.For example:6.732 becomes 6.7 when rounded to one decimal place.be careful though because if you had:4.376 it would become 4.4 when rounded to one decimal place because the '7' would have to be rounded up as it is greater than 5.
With a good sample, the sample mean gets closer to the population mean.
The mean increases by 10.
Decrease
You take the arithmetic mean of the two middle values.