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m_a_m_a [10]
3 years ago
11

a school has 520 students. dan surveys a random sample of 50 students and finds that 32 have pet cats. how many students are lik

ely to have pet cats?
Mathematics
2 answers:
Karo-lina-s [1.5K]3 years ago
8 0
333

32/50 = 0.64

64% of 520 is 332.8 ... hopefully there isn't .80 of a student somewhere in that school, so 333.
tensa zangetsu [6.8K]3 years ago
6 0

Answer:

333

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

First, we need tot find a general expression for the amount of caffeine remaining in the body after certain time. As the problem states that every hour x percent of caffeine leaves the body, we must substract that percentage from the initial quantity of caffeine, by each hour passing. That expression would be:

A= C_{0}(1-x)^t\\t: time \ in \ hours\\x: percentage \ of \ caffeine\ metabolized\\

Then, to find the amount of caffeine metabolized per hour, we need to differentiate the previous equation. Following the differentiation rules we get:

\frac{dA}{dt} =C_{0}(1-x)^t \ln (1-x)\\\frac{dA}{dt} =100*0.88\ln(0.88)\\\frac{dA}{dt} =-11.25 \frac{mg}{h}

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