Answer:
The mean wage is 16.55 Rupees.
You'll have to find the median yourself, as I'm not giving out the answers I'm just helping you do the work.
To find the mean:
To find the mean, add all the wages and divide by the number of labourers, 20.
The sum of all the wages is 331.
331/20 = 16.55
The mean wage is 16.55 Rupees.
To find the Median:
Arrange the data points from smallest to largest.
If the number of data points is odd, the median is the middle data point in the list.
If the number of data points is even, the median is the average of the two middle data points in the list.
source for median instructions: Khan Academy