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R Mean


Mean, Median, and Mode

In statistics, there are often three values that interests us:

  • Mean - The average value
  • Median - The middle value
  • Mode - The most common value

Mean

To calculate the average value (mean) of a variable from the mtcars data set, find the sum of all values, and divide the sum by the number of values.

Sorted observation of wt (weight)

1.513 1.615 1.835 1.935 2.140 2.200 2.320 2.465
2.620 2.770 2.780 2.875 3.150 3.170 3.190 3.215
3.435 3.440 3.440 3.440 3.460 3.520 3.570 3.570
3.730 3.780 3.840 3.845 4.070 5.250 5.345 5.424

Luckily for us, the mean() function in R can do it for you:

Example

Find the average weight (wt) of a car:

Data_Cars <- mtcars

mean(Data_Cars$wt)

Result:

[1] 3.21725
Try it Yourself »