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alisha [4.7K]
3 years ago
8

Explainhow to use the break apart strategy to find 247+358

Mathematics
1 answer:
Ksivusya [100]3 years ago
4 0
You can do expanded form. 200+40+7= 247
+30




0+50+8= 358
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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

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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:

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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.

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6 0
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