3 years ago

What expression represents 7 times the sum of a number and 8?

2 answers:

3 0

7(n + 8 You use the parentheses to know that that the adding comes first because usually in PEMDAS multiplication comes first.

Dmitry_Shevchenko [17]3 years ago

3 0

Answer:

y=7(8+x)

Step-by-step explanation:

not much to explain sry.

pls give thx and brainliest wannna level up

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3 years ago

The manager of a warehouse would like to know how many errors are made when a product's serial number is read by a bar-code read

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Answer:

$(a)\ \bar x =20.5$

$(b)\ \sigma = 14.54$

Step-by-step explanation:

Given

$x: 36, 14, 21, 39, 11, 2$

Solving (a): The mean of the 6 samples.

This is calculated as:

$\bar x = \frac{\sum x}{n}$

So, we have:

$\bar x =\frac{36+ 14+ 21+ 39+ 11+ 2}{6}$

$\bar x =\frac{123}{6}$

$\bar x =20.5$

Solving (b): The sample standard deviation.

This is calculated using:

$\sigma = \sqrt{\frac{\sum(x - \bar x)^2}{n-1}}$

So, we have:

$\sigma = \sqrt{\frac{(36 - 20.5)^2 + (14 - 20.5)^2 + (21 - 20.5)^2 + (39 - 20.5)^2 + (11 - 20.5)^2 + (2 - 20.5)^2}{6-1}}$

$\sigma = \sqrt{\frac{1057.5}{5}}$

$\sigma = \sqrt{211.5}$

$\sigma = 14.54$

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3 years ago

A scale model of the Empire State Building uses the scale 1 inch : 50 feet. If the model is 25 inches tall, how tall is the Empi

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Step-by-step explanation:

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