class Intervall:
  def __init__(self, minVal, maxVal):
    self.minVal = minVal
    self.maxVal = maxVal

  def getMittelpunkt(self):
    return (self.minVal + self.maxVal) / 2

  def check(self, x):
    return (self.minVal <= x <= self.maxVal)


i = Intervall(10.0, 20.0)
print(i.getMittelpunkt())
print(i.check(12))
print(i.check(25))