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  Main Properties of Normal Probability Curve | Statistics   Some of the properties are: 1. The normal curve is symmetrical 2. The normal curve is unimodal 3. Mean, median and mode coincide 4. The maximum ordinate occurs at the centre 5. The normal curve is asymptotic to the X-axis 6. The height of the curve declines symmetrically and Others. 1. The normal curve is symmetrical: The Normal Probability Curve (N.P.C.) is symmetrical about the ordinate of the central point of the curve. It implies that the size, shape and slope of the curve on one side of the curve is identical to that of the other. That is, the normal curve has a bilateral symmetry. If the figure is to be folded along its vertical axis, the two halves would coincide. In other words the left and right values to the middle central point are mirror  images. 2. The normal curve is unimodal: Since there is only one point in the curve which has maximum frequency, the normal probability curve is unimodal, i.e. it has o