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2 years ago

13

While mining, Nancy found a large metal bar that weighed 24 ounces, Nancy was also able to determine that the bar had 18 ounces

of zinc. What percent of the bar was zinc?

1 answer:

lord [1]2 years ago

4 0

Answer:

%75

Step-by-step explanation:

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2 ( 3 x 4) - 10 + 14/2 = 21<br><br> true or false

larisa86 [58]

Answer:

true

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2 years ago

The absolute values of two numbers that are additive inverses will ____________ be the same.

zhannawk [14.2K]

Answer:

A number and its additive inverse are always the same distance from zero, and so they have the same absolute value.

Step-by-step explanation:

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2 years ago

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What is the slope between the points (-3, 7) and (-5, 4)

IrinaVladis [17]

Answer:

3/2

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3 years ago

Simplify the following: (-83)2

Anika [276]

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2 years ago

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and

sergij07 [2.7K]

Answer:

a) sample size is 40

Step-by-step explanation:

(a)

$\sigma=4$ minutes

Margin of error, E is 75 seconds E=75/60= 1.25 minutes.

The level of significance $\alpha= 0.05$ for 95% level of significance

For 95% confidence interval $z_{\frac{\alpha}{2}}=1.96$ from standard deviation table

Sample size required, n

$n=\left (\frac{z_{\frac{\alpha}{2}}\cdot \sigma}{E} \right )^{2}=\left (\frac{1.96\cdot4}{75/60} \right )^{2}=39.337984$

Rounding off, n=40

Sample size =40

Keywords:

95% confidence, sample size, Wall Street Journal

3 0

3 years ago