A student noted the number of cars passing through a spot on a road for 100 periods each of 3 minutes and summarised it in the table given below. Find the mode of the data:
Number of cars |
0 − 10 |
10 − 20 |
20 − 30 |
30 − 40 |
40 − 50 |
50 − 60 |
60 − 70 |
70 − 80 |
Frequency |
7 |
14 |
13 |
12 |
20 |
11 |
15 |
8 |