. The following data represents the age of the buildings (in years) of a given area in Dar es Salaam.

10

12

11

11

18

14

37

15

27

21

15

7

2

12

11

15

25

4

3

9

16

10

24

2

20

18

3

12

29

12

(a) Construct the frequency table from this data using 6 classes.

(b) Calculate the lower quartile.