What is meaning of mean, median and quartile?
Mean is calculated by dividing the sum of the data values by the number of data values.
Median is the middle data value, at 50% of the data, where there is an equal probability of data values falling below or above it.
The lower/first quartile is at 25% of the data, or the middle between of the lower half of data.
The upper/third quartile is at 75% of the data, or the middle between the upper half of data.
Hope this helps!