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3 years ago

-18 + 11r = 26 please help

Mathematics

1 answer:

kicyunya [14]3 years ago

7 0

Answer:

r=4

Step-by-step explanation:

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You have been gotten a job offer and the company wants to start you out at

ipn [44]

I can tell you that 5% of 45,000 is 2250! so i think the equation would be something like 45,000 + 2250x

6 0

2 years ago

A normal population has mean μ-9 and standard deviation σ-5. Round the answers to fou decimal places. Part 1 What proportion of

Anvisha [2.4K]

Answer:

a) $P(X$

And we can find this probability using the normal standard table or excel:

$P(z$

b) $P(X\frac{5-\mu}{\sigma})=P(Z>\frac{5-9}{5})=P(z>-0.8)$

And we can find this probability using the complement rule and the normal standard table or excel and we got:

$P(z>-0.8)=1-P(z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Solution to the problem

Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:

$X \sim N(9,5)$

Where $\mu=9$ and $\sigma=5$

Part a

We are interested on this probability

$P(X$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

$z=\frac{x-\mu}{\sigma}$

If we apply this formula to our probability we got this:

$P(X$

And we can find this probability using the normal standard table or excel:

$P(z$

Part b

We are interested on this probability

$P(X>5)$

If we apply the z score formula to our probability we got this:

$P(X\frac{5-\mu}{\sigma})=P(Z>\frac{5-9}{5})=P(z>-0.8)$

And we can find this probability using the complement rule and the normal standard table or excel and we got:

$P(z>-0.8)=1-P(z$

7 0

3 years ago

Shopping While shopping for clothes, Tracy spent $28 less than 2 times what Daniel spent. Tracy

Lyrx [107]

Answer:

Daniel spent $ 19.

Step-by-step explanation:

Given that, while shopping for clothes, Tracy spent $28 less than 2 times what Daniel spent, and Tracy spent $ 10, to determine how much Daniel spent the following equation must be performed:

Daniel: X

Tracy: 2X - 28 = 10

2X - 28 = 10

2X = 10 + 28

X = 38/2

X = 19

2x19 - 28 = X

38 - 28 = X

10 = X

So, Daniel spent $ 19.

7 0

3 years ago