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Vanyuwa [196]
2 years ago
15

Help me as quickly as possible!! thank you

Mathematics
2 answers:
kari74 [83]2 years ago
8 0

Answer:

B

Step-by-step explanation:

I think thats right :)

Drupady [299]2 years ago
6 0

Answer:

B) 4X + 80 = 180

Step-by-step explanation:

Answer:

B

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A water well is to be drilled in the desert where the soil is either​ rock, clay or sand. The probability of rock ​P(R)equals=0.
GaryK [48]
The tree diagram for the probability is shown below

P(Clay|Positive) is read 'Probability of Clay given the result is Positive'.

This is a case of conditional probability.

The formula for conditional probability is given as
P(Clay|Positive) = P(Clay∩Positive) ÷ P(Positive)

P(Clay∩Positive) = 0.21×0.48 = 0.1008

P(Positive) = P(Rock∩Positive) + P(Clay∩Positive) + P(Sand∩Positive)
P(Positive) = (0.53×0.53) + (0.21×0.48) + (0.26×0.75)
P(Positive) = 0.2809 + 0.1008 + 0.195
P(Positive) = 0.5767

Hence,
P(Clay|Positive) = 0.1008÷0.5767 = 0.175 (rounded to 3 decimal place)

5 0
3 years ago
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