Question

one out of 10 lightbulbs in a pack are broken. If there are 100 lightbulbs in a box, how many would you expect to be broken?

Answer 1

Out of 10 Lb - 1 is broken
out of 5*10=50 Lb-5 are broken

Answer 2

a more mathematical way is to first find probability of a bulb being broken.
remember : probability = no. of favorable events/ total number of events.

once you find probability, expected value is just probability * total number of events required.

Answer 3

and bdw
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