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Lana71 [14]
3 years ago
9

80% as a fraction in simplest form

Mathematics
2 answers:
adell [148]3 years ago
8 0
Percent is basically a fraction out of 100.

80% = 80/100.
80/100 = 8/10 = 4/5.
defon3 years ago
4 0
80% = 80 / 100

80 divided by 20...
100 divided by 20...

80/100 = 4/5
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Answer:

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E=z\frac{\sigma}{\sqrt{n}}\\\\\sqrt{n}=\frac{z\sigma}{E}\\\\n=[\frac{z\sigma}{E}]^2\\\\\therefore n=[\frac{1.75\times 1.8}{0.5}]^2\\\\=39.69\approx 40

Hence, he needs approximately 40 boys for the study

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