An institute where electric bulbs are manufactured states that the probability of the life time of a bulb being less than 1000 hours is 1/100.
Draw a tree diagram to show the life time of two bulbs a customer has purchased.
Find the probability
1.That both bulbs will be worn out before 1000 hours
2.That both bulbs will have a life time of more than 1000 hours
3.At least one of the two bulbs will last for more than 1000 hours.

Question

An institute  where electric bulbs are manufactured states that the probability of the life time of a bulb being less than 1000 hours is 1/100. 
Draw a tree diagram to show the life time of two bulbs a customer has purchased.
Find the probability 
  1.That both bulbs will be worn out before 1000 hours
  2.That both bulbs will have a life time of more than 1000 hours 
  3.At least one of the two bulbs will last for more than 1000 hours.

anonymous · Answer

1. 1/100 x 1/100
2. 99/100 x 99/100
3. 1/100 x 99/100 x 2

anonymous · Answer

Can u draw the tree diagram...:)

anonymous · Answer

I'm not familiar with tree diagram..Show me how a tree diagram is and then i'll draw it for this question

anonymous · Answer

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anonymous · Answer

Or you can divide the third branch as :
1. first bulb below 1000hrs and the second above 1000hrs
2. the second bulb below 1000hrs and the first above 1000hrs

anonymous · Answer

I'll be right back..going for dinner

anonymous · Answer

Well when drawing a tree diagram for tossing a unbiased coin two times
would be like this..
 |dw:1350143627688:dw|

anonymous · Answer

Ahh ok have the dinner and return here soon. I'll be waiting for u..

experimentx · Answer

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