For a particular year following is the distribution of ages (in years) of primary school teachers in a district - Maths - Statistics

Question

For a particular year following is the distribution of ages (in
years) of primary school teachers in a district

Age (in years)

15-20

20-25

25-30

30-35

35-40

40-45

45-50

No of teachers

10

30

50

30

6

4

1) 1) Write
the lower limit of first class interval
2) 2)
Determine the class limits of the fourth class interval
3) 3) Find
the class mark of the class 45-50
4) Determine
the class-size

Gursheen kaur. · Accepted Answer

1) The lower limit of first class
interval=15

2) The class limits of the fourth class
interval=30-35

3) Class mark of the class 45-50
is

4) Class-size:The
class size of any class interval is the difference between the
lower and upper limit of the given class interval and the minimum
class size is the smallest class size

Age
No of
teachers

Class size

15â€“ 20
20 â€“ 25
25 â€“ 30
30â€“ 35
35â€“ 40
40-45
45-50

10
30
50
50
30
0
4

20-15=5
25-20=5
30-25=5
35-30=5
40-35=5
45-40=5
50-45=5

In the given data, it can be observed that
the class size is 5 for each interval