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ale4655 [162]
3 years ago
13

-3x+9y=-54 what is the y intercepts

Mathematics
2 answers:
3241004551 [841]3 years ago
5 0
One way to find the y int is to sub in 0 for x and solve for y

-3x + 9y = -54
-3(0) + 9y = -54
9y = -54
y = -54/9
y = -6....so ur y int is -6 or (0,-6)
sergey [27]3 years ago
5 0
Simple...

you have: -3x+9y=-54

If you want to find the yi-intercept of this line you must first re-write it in y=mx+b form-->>

-3x+9y=-54

-3x+9y=-54
+3x      +3x

9y=3x-54

Now divide by 9...

\frac{9y}{9} = \frac{3x-54}{9}

y=\frac{1}{3} x-6

As we can see the y-intercept is located at (0,-6).

Thus, your answer.

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If a random sample of size nequals=6 is taken from a​ population, what is required in order to say that the sampling distributio
goldenfox [79]

Answer:

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

In order to satisfy this distribution we need that each observation on this case comes from a normal distribution, because since the sample size is not large enough we can't apply the central limit theorem.

Step-by-step explanation:

For this case we have that the sample size is n =6

The sample man is defined as :

\bar X = \frac{\sum_{i=1}^n X_i}{n}

And we want a normal distribution for the sample mean

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

In order to satisfy this distribution we need that each observation on this case comes from a normal distribution, because since the sample size is not large enough we can't apply the central limit theorem.

So for this case we need to satisfy the following condition:

X_i \sim N(\mu , \sigma), i=1,2,...,n

Because if we find the parameters we got:

E(\bar X) =\frac{1}{n} \sum_{i=1}^n E(X_i) = \frac{n\mu}{n}=\mu

Var(\bar X)= \frac{1}{n^2} \sum_{i=1}^n Var(X_i) = \frac{n\sigma^2}{n^2}= \frac{\sigma^2}{n}

And the deviation would be:

Sd (\bar X) = \frac{\sigma}{\sqrt{n}}

And we satisfy the condition:

\bar X \sim N(\mu , \frac{\sigma}{\sqrt{n}})

3 0
3 years ago
Can someone help me with this question? i will mark brainliest
zysi [14]
The answer is 0.9
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3 0
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Mary only has $28.50 in her wallet. For which of the following does she have enough money. $40 shirt with a 20% discount, $26 di
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Step-by-step explanation:


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myrzilka [38]

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no

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since;

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4 0
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