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min and max

The minimum and maximum of a set of numbers can be calculated with Math.min() and Math.max():
var min = Math.min(5, 7);
var max = Math.max(3, 9, 2);
min receives the value 5 and max the value 9. The special: Both functions can be called with an arbitrary number of arguments.

Exercise

Write a function midrange, that calculates the midrange of 3 numbers. The midrange is the mean of the smallest and largest number. midrange(3, 9, 1) should return (9+1)/2 = 5.
var midrange = function(a, b, c) {
  var min = Math.min(a, b, c);
  var max = Math.max(a, b, c);
  ...
};
var midrange = function(a, b, c) {
  var min = Math.min(a, b, c);
  var max = Math.max(a, b, c);
  return (min + max) / 2;
};