The time required for students to do a science experiment and the number of students is shown in the following grouped frequency distribution table. Show the information by a histogram and also by a frequency polygon.
Time required for experiment (minutes) |
20-22 |
22-24 |
24-26 |
26-28 |
28-30 |
30-32 |
No. of Student |
8 |
16 |
22 |
18 |
14 |
12 |