3 years ago

Megan bought 3 pounds of apples that cost x dollars per pound. She gave the cashier a 20-dollar bill.

Mathematics

1 answer:

sergiy2304 [10]3 years ago

6 0

Answer:

3x-20

Step-by-step explanation:

I had this test yesterday and this was the correct answer

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Question 12 (1 point) Given P(A) 0.34, P(A and B) 0.27, P(A or B) 0.44, what is P(B)? Answer in decimal form. Round to 2 decimal

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Answer: The required probability of event B is P(B) = 0.37.

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We are to find the probability of event B, P(B) = ?

From the laws of probability, we have

$P(A\cup B)=P(A)+P(B)-P(A\cap B)\\\\\Rightarrow 0.44=0.34+P(B)-0.27\\\\\Rightarrow 0.44=0.07+P(B)\\\\\Rightarrow P(B)=0.44-0.07\\\\\Rightarrow P(B)=0.37.$

Thus, the required probability of event B is P(B) = 0.37.

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