Question

It is known that a box of 550 electric blubs cointain 22 defective bulb. One bulb is taken out at random out of box . Find the probability of getting i) a defective bulb i) a good bulb

Answer 1

Hi there !!

Total number of bulbs = 550
No: of defective bulbs = 22
No: of bulbs that are not defective = 550 - 22 = 528

i)
Probability of a defective bulb = No: of defective bulbs / Total number of bulbs
= 22/550
= 2 / 50
= 1/25

ii)Probability of a bulb that is not defective = No: of bulbs that are not defective / Total number of bulbs
= 528 / 550

Answer 2

Hi friend
____________
Total Electric bulbs = 550 
defective bulbs        = 22 
 Good bulbs             = 550-22
                                  =528 
_____________________________________________________________
Probability of that the bulb is damaged = 22/550
                                                                   =  1/25  
Probability  that the bulb is good           = 1- 1/25 
                                                                   =     24 /25