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denis-greek [22]
3 years ago
12

A batch consists of 12 defective coils and 88 good ones. Find the probability of getting two good coils when two coils are rando

mly selected if the first selection is replaced before the second is made. 0.7744 0.7733 0.0144 0.176
Mathematics
1 answer:
Allushta [10]3 years ago
5 0

<u>Answer:</u>

The probability of getting two good coils when two coils are randomly selected if the first selection is replaced before the second is made is 0.7744  

<u>Solution:</u>

Total number of coils = number of good coils + defective coils = 88 + 12 = 100

p(getting two good coils for two selection) = p( getting 2 good coils for first selection ) \times p(getting 2 good coils for second selection)

p(first selection) = p(second selection) = \frac{\text { number of good coils }}{\text { total number of coils }}

Hence, p(getting 2 good coil for two selection) = \frac{88}{100} \times \frac{88}{100} =\bold{0.7744}

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