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34kurt
3 years ago
8

Help plz what is the answer

Mathematics
1 answer:
SpyIntel [72]3 years ago
3 0

Answer:

x=50

Step-by-step explanation:

\frac{x}{5}+15=25\\ \frac{x}{5}+15 -15 =25 - 15 \leftarrow\text { Use the Subtraction Property of Equality}\\

\frac{x}{5}=10\\\\\frac{x}{5}*\frac{5}{x} =10*5\leftarrow \text { Multiplication Property of Equality}  \\\\\boxed{x=50}

<h3>Checking by Substitution:</h3>

\frac{50}{5} +15=25\\\rightarrow 50/5=10\\10+15=25\\\boxed {25=25}

'x = 50' is correct.

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Answer:

0.227 = 22.7% probability that the mean printing speed of the sample is greater than 18.12 ppm.

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

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Problems of normal distributions can be solved using the z-score formula.

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For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

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This means that \mu = 17.42, \sigma = 3.25

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This means that n = 12, s = \frac{3.25}{\sqrt{12}}

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This is 1 subtracted by the p-value of Z when X = 18.12.

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Z = \frac{X - \mu}{s}

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