Question

The probability that a bulb produced by a factory will fuse after 150 days on use is 0.05. Find the probability that out of 5 such bulbs 

(i) none 

(ii) not more than one

(iii) more than one 

(iv) at least one will fuse after 150 days of use.

Answer 1

Probability that a bulb will fuse after 150 days p = 0.05 

Probability that bulb will not fuse after 150 days q = 1 – p = 1 – 0.05 = 0.95