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2 years ago

Solve for 9(x + 1) = 25+x

Mathematics

2 answers:

den301095 [7]2 years ago

4 0

Answer:

Step-by-step explanation:

9(x+1)=25+x

9x+9=25+x

9x-x=25-9

8x=16

x=16/8

x=2

Murljashka [212]2 years ago

3 0

The answer for this question is x=2

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3 years ago

Twenty percent of drivers driving between 10 pm and 3 am are drunken drivers. In a random sample of 12 drivers driving between 1

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Answer:

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(b) 0.36909

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Step-by-step explanation:

Given information:

n=12

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q = 1-p = 1-0.2 = 0.8

Binomial formula:

$P(x=r)=^nC_rp^rq^{n-r}$

(a) Exactly two will be drunken drivers.

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Therefore, the probability that exactly two will be drunken drivers is 0.28347.

(b)Three or four will be drunken drivers.

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Using binomial we get

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(c)

At least 7 will be drunken drivers.

$P(x\geq 7)=1-P(x$

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$P(x\leq 5)=P(x=0)+P(x=1)+P(x=2)+P(x=3)+P(x=4)+P(x=5)$

$P(x\leq 5)=0.06872+0.20616+0.28347+0.23622+0.13288+0.05315$

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