contestada

the factory makes light bulbs the probability that a bulb is defective is 1/15 if 300 light bulbs are tested about how many are expected to be defective

a 20

b 66

c 15

d 30

Respuesta :

defective : working = 1/15 ( x20 ) 20/300
so the answer is 20 light bulbs
A) you can make a ratio of 1/15 = x/300

300x1 = 300

300/15 = 20

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