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Nina [5.8K]
3 years ago
9

17+4h+2=1-5h what does the variable equal ?

Mathematics
1 answer:
olga2289 [7]3 years ago
5 0
1. 17+4h+2=1-5h
2. 19+4h=1-5h
3. 18+4h=-5h
4. 18=-9h
5. -2=h
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yKpoI14uk [10]
X=3
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4 0
2 years ago
ASAPPP!!!!!
Sergio039 [100]

Answer:

185

Step-by-step explanation:

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3 years ago
Suppose that the time (in hours) required to repair a machine is an exponentially distributed random variable with mean 1/0.41/0
lbvjy [14]

Answer:

a) P(t>3)=0.30

b) P(t>10|t>9)=0.67

Step-by-step explanation:

We have a repair time modeled as an exponentially random variable, with mean 1/0.4=2.5 hours.

The parameter λ of the exponential distribution is the inverse of the mean, so its λ=0.4 h^-1.

The probabity that a repair time exceeds k hours can be written as:

P(t>k)=e^{-\lambda t }=e^{-0.4t}

(a) the probability that a repair time exceeds 3 hours?

P(t>3)=e^{-0.4*3}=e^{-1.2}= 0.30

(b) the conditional probability that a repair takes at least 10 hours, given that it takes more than 9 hours?

The exponential distribution has a memoryless property, in which the probabilities of future events are not dependant of past events.

In this case, the conditional probability that a repair takes at least 10 hours, given that it takes more than 9 hours is equal to the probability that a repair takes at least (10-9)=1 hour.

P(t>10|t>9)=P(t>1)

P(k>1)=e^{-0.4*1}=0.67

6 0
3 years ago
Subtract<br><br>40(-32-40-25)<br>please show how you will do that (step by step)​
sergeinik [125]

Answer:

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Step-by-step explanation:

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Please give brainliest if this answer satisfies your question.

4 0
2 years ago
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I am not sure I am so so so sorry My friend

7 0
3 years ago
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