Math quiz: A hospital has 2,200 ventilators available, and expects 350 will be needed each day this week. The average patient uses a ventilator for seven days. How many days of ventilator supply does the hospital have under these assumptions? #coronavirus #ventilators
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So some people would be more than 7 days as well, you have to use 7 in the math as the expected usage time per ventilator.
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Average also says some people more. Depending how widely the average is dispersed you could make it through the seventh day--but day 8 would be bad.
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That was my perception. However, I did a model, and if your SD is large enough, you actually have enough ventilators.
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And some more! Still not enough

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Even if some average more, the number of new needed wouldn’t be 350 on day 7
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Can't tell specifics from the average. If 10% of the people use ventilators for 100 days then it skews the average.
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Likewise with people using them less
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You would need to know the distribution of days on a ventilator to answer that question. We could assume a normal distribution, but still need a variance.
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This is the correct answer. If we knew the distribution and variance, then the answer would be in terms of a confidence interval.
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1-We assume that 350 people entered the first day they went out on the seventh day, we do not need support 2-We assume that the 350 entered the first day and continued the seventh day. We need a day of support I tend to assume that there is no support day
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