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Ierofanga [76]
3 years ago
10

If the location you want to go is 270 miles away and you want to get there in 4.5 hours, at what constant speed do you need to d

rive?
Mathematics
2 answers:
madreJ [45]3 years ago
4 0
The units of speed are miles per hour. You get that by dividing miles by hours:
  (270 mi)/(4.5 h) = 60 mi/h
Alexxx [7]3 years ago
4 0

Answer:

60 miles per hour

Step-by-step explanation:

The location you want to go is 270 miles away.

You want to cover this distance in 4.5 hours.

Formula to get  Speed=\frac{Distance}{Time}

Speed=\frac{270}{4.5} = 60 miles/hour

Unit of speed is miles per hour

You need to drive at 60 miles per hour.

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One hundred items are simultaneously put on a life test. Suppose the lifetimes
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Answer:

a) \mathrm{E}[\mathrm{T}]=\sum_{\mathrm{H}}^{5} \frac{200}{101-i}

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Step-by-step explanation:

Given:

The lifetimes of the individual items are independent exponential random variables.

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Assume, Ti be the time between ( i-1 )st and the ith failures. Then, the T_{i} are independent with \mathrm{T}_{\mathrm{i}} being exponential with rate \frac{(101-i)}{200} .

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b)

The variance is given by, \mathrm{Var}[\mathrm{T}]=\sum_{i=1}^{5} \mathrm{Var}[T]

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