2 years ago

Division problems to solve for 4th grade

Mathematics

1 answer:

Scrat [10]2 years ago

4 0

10 ÷ 2
27 ÷ 3
72 ÷ 8
84 ÷ 21 (can be difficult for some)
24 ÷ 8
69 ÷ 3
56 ÷ 7
39 ÷ 13

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If a 24 pack of cans is 2 for $9 what is the ratio of the number of cans to price

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2:9 should be the answer

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Sand to cement
7:3

210:x

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In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2455 subjects randomly select

Genrish500 [490]

Answer: 0.355,0.405)

Step-by-step explanation:

Given : Significance level : $\alpha=1-0.99=0.01$

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The confidence interval for proportion is given by :-

$p\pm z_{\alpha/2}\times\sqrt{\dfrac{p(1-p)}{n}}$

$0.38\pm z_{0.005}\times\sqrt{\dfrac{0.38(1-0.38)}{2455}}\\\\=0.38\pm(2.576)0.0098\\\approx0.38\pm0.025=(0.355,0.405)$

Hence, the 99% confidence interval for the proportion of returned surveys : (0.355,0.405)

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3 years ago