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3 years ago

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The speed of baseball crossing home plate after being pitched depends on its initial velocityif thrown at 74 mph, the speed over

home plate will be 72.2 mphIf thrown at 50 mph, the speed over home plate will be 44.7 mph.

1 answer:

LuckyWell [14K]3 years ago

4 0

Answer:

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Step-by-step explanation:

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Four friends are out for a walk at night and come to an old bridge. It isn’t safe to cross the bridge without a flashlight, and

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The minimum number of times would be 5 times.

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2 years ago

If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard

Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is required?

A samle size of at least n is required, in which n is found when $M = 3, \sigma = 20$

So

$M = z*\frac{\sigma}{\sqrt{n}}$

$3 = 1.96*\frac{20}{\sqrt{n}}$

$3\sqrt{n} = 20*1.96$

$\sqrt{n} = \frac{20*1.96}{3}$

$(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}$

$n = 170.7$

Rouding up

The sample size required is at least 171

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2 years ago

(5x2−3x−2)−(−2x2−x+10)<br><br><br><br> in standard form please?

Andreyy89

Answer:

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Step-by-step explanation:

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2 years ago

The marginal cost function for a company is given by

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Step-by-step explanation:

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2 years ago

Rounding or compatible numbers for 87 + 34

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87 ⇒ 90

34 ⇒ 30
---- -----
121 120

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2 years ago

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