Shown here are four frequency distributions. Each is incorrectly constructed. State the reason why.
a.
Class Frequency
27–32 .......1
33–38 .......0
39–44 .......6
45–49 .......4
50–55 .......2
b.
Class Frequency
5–9.......1
9–13 ........2
13–17 ......5
17–20 ......6
20–24 ......3
c.
Class Frequency
123–127 ....3
128–132 ....7
138–142 ....2
143–147 ....19
d.
Class Frequency
9–13 .....1
14–19 ......6
20–25 ......2
26–28 ......5
29–32 ......9