Working together, Sam and Charlie can change all the light bulbs in the office building in 3 hours. It would have taken Charlie 8 hours to do the job alone. A table showing Rate in part per hour, Time in hours, and Part of Light Bulbs Changed. The first row shows,Sam, and has r, 3, and r times 3. The second row shows Charlie, and has StartFraction 1 Over 8 EndFraction, 3 and StartFraction 1 Over 8 EndFraction times 3. Which equation can be used to solve for the rate, r, for Sam to change all the light bulbs in the office building by himself? 3r = 3 r equals StartFraction 3 Over 8 EndFraction. 3r + 3 r plus StartFraction 3 Over 8 EndFraction equals 1. = 1 r + StartFraction 1 Over 3 EndFraction r plus StartFraction 3 Over 8 EndFraction r equals 1.r = 1 r + StartFraction 1 Over 3 EndFraction r plus StartFraction 1 Over 8 EndFraction r equals 1.r = 1

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Ответ:

risarod6106

17.09.2021

Mathematics

The number of doctors 'n' = 6.76

Step-by-step explanation:

Explanation:-

Given Estimate of the true population proportion = 5 % = 0.05

Given level of significance ∝ = 99% or 1%

Z₀.₀₁ = 2.576

The margin of error is determined by

$M.E = \frac{2.576 X \sqrt{p(1-p)} }{\sqrt{n} }$

we know that $\sqrt{p(1-p)} \leq \frac{1}{2}$

$0.05 = \frac{2.576 X \frac{1}{2} }{\sqrt{n} }$

Cross multiplication , we get

$\sqrt{n} = \frac{2.576 X \frac{1}{2} }{5}$

√n = 0.2576≅0.26

squaring on both sides,we get

n = 0.0676 X 100

n= 6.76

Final -

The number of doctors 'n' = 6.76

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