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  4. Return the gmean value
def gmean(x)
  prod=1.0
  x.each {|v| prod *= v}
  prod**(1.0/x.size)
end
data = [1.1,2.3,3.3,1.2,4.5,2.1,6.6 ]
gm = gmean(data)  # 2.508411474