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2 years ago

What is the first step to solve the equation 12z - 21 = 92?

Mathematics

1 answer:

aivan3 [116]2 years ago

4 0

12z - 21 = 92

12z - 21 + 21 = 92 + 21

12z = 113

z = 113/12

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Step-by-step explanation:

For this case we have the following probabilities given:

$P(A) = 0.7, P(B) =0.7, P(A \cup B) =0.9$

Part a

We want to calculate the following probability: $P(A \cap B)$

And we can use the total probability rule given by:

$P(A \cup B) = P(A) +P(B) - P(A\cap B)$

And if we solve for $P(A \cap B)$ we got:

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$P(A\cup B) = P(A) + P(B)$

We have that:

$0.9 \neq 0.3+0.7 =1$

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$P(A \cap B) = P(A) *P(B)$

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$0.1 \neq 0.7*0.3 = 0.21$

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