def meanwithoutlierrejection(self):
    ' TO DO: Calculate the mean, rejecting values that exceed 3-sigma\n        from existing estimate.'
    pass
TO DO: Calculate the mean, rejecting values that exceed 3-sigma
from existing estimate.
def meanwithoutlierrejection(self):
    ' TO DO: Calculate the mean, rejecting values that exceed 3-sigma\n        from existing estimate.'
    pass