A class of students was asked to name their favorite colour from the spectrum of seven colours and the results were as follows:
red, green, blue, indigo, indigo, violet, yellow, yellow, blue, orange, green, blue, yellow, indigo, violet, blue, blue, red, yellow, green.
The mode is:
The heights of 15 children, to the nearest centimetre, are given below:
The range of heights is: