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BaLLatris [955]

3 years ago

8

Mark has 8 hours to mow 6 lawn while Tony take 10 hours to mow 8 lawns how many hours will the faster worker take to mow 72 lawn

s?

1 answer:

inessss [21]3 years ago

4 0

Answer: 93.6 hrs

Step-by-step explanation: 8hr ÷ 6yards = 1.3 yards per hr.

72 yards × 1.3 yards per hr = 93.6 hrs

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A building contains two elevators, one fast and one slow. The average waiting time for the slow elevator is 3 min. and the avera

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Answer: The expected waiting time is $1\dfrac{2}{3}\ min$

Step-by-step explanation:

Since we have given that

Average waiting time for slow elevator = 3 min

Average waiting time for fast elevator = 1 min

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Probability that a person choose the slow elevator = $\dfrac{1}{3}$

So, the expected waiting time would be

$E[x]=\sum xp(x)=3\times \dfrac{1}{3}+1\times \dfrac{2}{3}\\\\=1+\dfrac{2}{3}\\\\=\dfrac{3+2}{3}\\\\=\dfrac{5}{3}\\\\=1\dfrac{2}{3}\ min$

Hence, the expected waiting time is $1\dfrac{2}{3}\ min$

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