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3 years ago

Please help me with this and Explain!

Mathematics

2 answers:

slavikrds [6]3 years ago

6 0

So a=25, b=12, c=4, d=4, right?

What you will do is 25 + (12 + 4) x 4
Of course, focus on the one with the parenthesis first.

nevsk [136]3 years ago

4 0

If a =25 b=12 c=4 d=4
You can just put these numbers
a+(b+c) x d=25+(12+4) x 4=25+16 x 4 =25+64=89

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3 years ago

A commuter crosses one of three bridges, A, B, or C, to go home from work. The commuter crosses bridge A with probability 1/3, c

mihalych1998 [28]

Answer:

0.1333 = 13.33% probability that bridge B was used.

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: Arrives home by 6 pm

Event B: Bridge B used.

Probability of arriving home by 6 pm:

75% of 1/3(Bridge A)

60% of 1/6(Bridge B)

80% of 1/2(Bridge C)

$P(A) = 0.75*\frac{1}{3} + 0.6*\frac{1}{6} + 0.8*\frac{1}{2} = 0.75$

Probability of arriving home by 6 pm using Bridge B:

60% of 1/6. So

$P(A \cap B) = 0.6*\frac{1}{6} = 0.1$

Find the probability that bridge B was used.

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0.1333 = 13.33% probability that bridge B was used.

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3 years ago