Under this method, the value of mode or the modal class is determined by simple inspection of the distribution. The value which is observed to have occurred for maximum times, or the value (or the class of values) against which the maximum frequency stands is taken as the modal value , or the modal class.When more than one value, or class appear with the same maximum frequency, all such values or the classes are taken as the modal values or the modal classes. In such cases, the series is marked as a bimodal, trimodal, or multimodal series in accordance with the number of modal values the series possesses.
While locating the mode under this method, care must be taken to see that there is a great difference between the maximum frequency and the next maximum frequency. If the difference between the two is very much, the mode can be located safely against the maximum frequency lest the method of grouping should be followed to located he value of the mode, or the modal class.