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soldi70 [24.7K]
3 years ago
13

A supplier delivers an order for 20 electric toothbrushes to a store. by accident, three of the electric toothbrushes are defect

ive. what is the probability that the first two electric toothbrushes sold will be returned because they are defective?
Mathematics
1 answer:
evablogger [386]3 years ago
3 0
<span>3 of the 20 toothbrushes are defective, so the initial probability of selecting a defective toothbrush on the first try is 3/20. After that, there will be 2 defective toothbrushes in the remaining 19, so the probability of selecting one of those on the 2nd try will be 2/19. To get the probability of those two events happening sequentially, we multiply the two probabilities. Thus (3/20)*(2/19) = 6/380 = 0.0157, or about 1.6%.</span>
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REQUIRED CHART :

The required chart has been attached

Answer:

31.8%

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Step-by-step explanation:

Required :

To obtain the Difference between Sweden and United States high and medium categories to the nearest %

Sweden :

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Alternatively
= 1- poisson(4,2,1) =0.052653
P(X > 5 | mean =2) = 1- p(x
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alternatively=1-poisson(5,2,1)
=0.016564
4 0
3 years ago
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