The histogram gives the information about the number of literate males along with their age. How many males are literate?
The frequencies in the different age groups:
10-20 years: 300 literate males
20-30 years: 600 literate males
30-40 years: 800 literate males
40-50 years: 500 literate males
Therefore, the required number is 300+600+800+500 = 2200