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sertanlavr [38]
2 years ago
14

Set 2 Maths has 30 pupils in it.

Mathematics
1 answer:
Ierofanga [76]2 years ago
4 0
80/100 x 30 = 24 because you just multiply percents
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Answer:

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Step-by-step explanation:

We have these following probabilities:

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50% of the second sprinkler being triggered

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What is the probability that the sprinkler head will be activated?

P = P_{1} + P_{2}

P_{1} is the probability of the first sprinkler being triggered and activated. So:

P_{1} = 0.5*0.9 = 0.45

P_{2} is the probability of the second sprinkler being triggered and activated. So:

P_{2} = 0.5*0.8 = 0.40

P = P_{1} + P_{2} = 0.40 + 0.45 = 0.85

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