Question

A lot of 20 bulbs contains 4 detective bulbs .a bulbs is drawn at random. find the probability of having a good bulb​

Answer 1

P(Defective bulb)=
Total Bulbs
Defective Bulbs
​
=
20
4
​
=
5
1
​



ii) Since one bulb is already drawn, the number of bulbs remaining is 19.
Number of non defective bulbs is 15 as one bulb is picked.
P(Non-defective)=
19
15
​
.

Answer 2

Answer:

4/5

Step-by-step explanation:

Probability = No. of desired observations/ Total no. of observations

No. of good bulbs=20-4=16

Probability of having a good bulb= 16/20=4/5