The symmetrical clustering of values around a central location. The properties of a normal distribution include: (1) it is a continuous, symmetrical distribution: both tails extend to infinity; (2) the arithmetic mean, mode and median are identical; and (3) its shape is completely determined by the mean and standard deviation.
see distribution; significance.
A term used in several di?erent senses. Generally speaking, it is applied to anything which agrees with the regular and established type. In chemistry, the term is applied to solutions of acids or bases of such strength that each litre contains the number of grams corresponding to the molecular weight of the substance in question. In physiology the term ‘normal’ is applied to solutions of such strength that, when mixed with a body ?uid, they are ISOTONIC and cause no disturbance: for example, normal saline solution.... normal
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