|
Concentration of SO2 (in ppm) |
Number of days (frequency ) |
|
0.00 - 0.04 |
4 |
|
0.04 - 0.08 |
9 |
|
0.08 - 0.12 |
9 |
|
0.12 - 0.16 |
2 |
|
0.16 - 0.20 |
4 |
|
0.20 - 0.24 |
2 |
|
Total |
30 |
Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12 - 0.16 on any of these days.
Number days for which the concentration of sulphur dioxide was in the interval of 0.12 - 0.16 = 2
Total number of days = 30
Hence, required probability, P = 2/30
= 1/15
