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fomenos
3 years ago
11

If I started class at 1:30 and class ends in 90 minutes what time is class over?

Mathematics
2 answers:
Lubov Fominskaja [6]3 years ago
8 0
Easy it wil be ending at 3:00 because 1:30 dived by 90 is 300 so 3:00
VashaNatasha [74]3 years ago
6 0
Well.. divide 90 into 60, so 1.5 this means 1.5 hours, and then add it to 1:30 which is = 3:00 o'clock
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We need a sample size of 564.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

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\sqrt{n} = \frac{1.96\sqrt{0.6231*0.3769}}{0.04}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.6231*0.3769}}{0.04})^{2}

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We need a sample size of 564.

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