Calculating the mean of an array of numbers

20130407_calc_mean_of_an_array

describe 'mean' do
  let(:array_1) { [1, 2, 3, 4, 5, 5, 7] }
  let(:array_2) { [4, 4, 5, 5, 6, 6, 6, 7] }
 
  it "is defined as a method" do
    defined?(mean).should eq 'method'
  end
 
  it "requires a single argument" do
    method(:mean).arity.should eq 1
  end
 
  it "returns the correct mean of array 1" do
    mean(array_1).should eq 3.857142857142857
  end
 
  it "returns the correct mean of array 2" do
    mean(array_2).should eq 5.375
  end
end

20130407_calc_mean_of_an_array.rb

def mean(array)
  arraycnt = array.count
  sum = 0
  
    array.each do |i|
    sum += i
    end
  
  sumtotal = sum / arraycnt 
  return sumtotal.to_f
   
end
    
#let(:array_1) { [1, 2, 3, 4, 5, 5, 7] } sum = 27
#let(:array_2) { [4, 4, 5, 5, 6, 6, 6, 7] } sum = 43

#The mean is the average of the numbers.