Bulbs are packed in a cartoon each containing 40 bulbs. 700 cartoons were examined for defective bulbs and results are given in the table.
No. of defective bulbs Frequency
0 400
1 180
2 48
3 41
4 18
5 8
6 3
more than 6 2
One cartoon is selected at random. What is the probability that it has:
a)no defective bulbs.
b)defective bulbs from 2 to 6.
c)defectve bulbs less than 4.
number of defective bulbs | 0 | 1 | 2 | 3 | 4 | 5 | 6 | more than 6 |
frequency | 400 | 180 | 48 | 41 | 18 | 8 | 3 | 2 |