Respuesta :
It is true by definition of a probability curve.
Area under the domain of ALL continuous probability curves is 1.0.
If the area under a curve's domain does not add up to 1.0, it is not a probability curve. (contrapositive of the same statement!)
Area under the domain of ALL continuous probability curves is 1.0.
If the area under a curve's domain does not add up to 1.0, it is not a probability curve. (contrapositive of the same statement!)