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In a specific year, the distribution of the ages (in years) of primary teachers of a district is given:
Age (in years)
Number of teachers
15–20
10
20–25
30
25–30
50
30–35
35–40
40–45
6
45–50
4
(i) What is the lower limit of the first class interval?(ii) What are the limits of the fourth class interval?(iii) What is the class mark of the class 45–50?
