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2 years ago

14

On a school trip to the space museum, 30 students visited the astronaut exhibit. Tickets for admission cost $18. Which expressio

n can be used to mentally compute the total cost of admission tickets?
A. 30(10 + 8) C. 15(2 + 8)
B. 15 · 2 + 10 · 8 D. 30(10 – 8)

1 answer:

CaHeK987 [17]2 years ago

6 0

The answer is B to your question

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Answer:

The probability is: 0.8889.

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

$P(B|A) = \frac{P(A \cap B)}{P(A)}$

In which

P(B|A) is the probability of event B happening, given that A happened.

$P(A \cap B)$ is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Approved

Event B: Qualified

Probability of a person being approved:

80% of 75%(qualified)

30% of 25%(not qualified). So

$P(A) = 0.8*0.75 + 0.3*0.25 = 0.675$

Probability of a person being approved and being qualified:

80% of 75%, so:

$P(A \cap B) = 0.8*0.75$

Find the probability that a person is qualified if he or she was approved by the manager.

$P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.8*0.75}{0.675} = 0.8889$

The probability is: 0.8889.

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