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Kisachek [45]
3 years ago
5

Which solid has congruent horizontal and vertical cross sections?

Mathematics
1 answer:
Zinaida [17]3 years ago
3 0

Answer:

triangular prism (pyramid) and cylinder.

Step-by-step explanation:

A pyramid is a polyhedron with one base that is a polygon and faces that are triangles.

A cylinder is a three-dimensional figure with congruent, parallel bases that are circles connected with a curved side.

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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
If a/4 = b/7, what is the value of a-b/b?<br> HELPPP! PLS
earnstyle [38]
A/4 = b/7 Cross multiply: 7a =4b Divide by b: (7a/b)=4 Multiply by 1/7: a/b =4/7 
4/7 is your answer
8 0
3 years ago
What are the three methods used to identify sample spaces ?
vagabundo [1.1K]
 A venn diagram, a tree diagram, and a last but not least a graphical representation. 

If this helps I am glad it did! (:
7 0
3 years ago
Read 2 more answers
5x-2y=30<br> Complete the missing value in the solution to the equation.<br> (8,__ )
vredina [299]

Answer:

the y value equals 5

Step-by-step explanation:

(x,y)so

plug in 8 for x

5(8)=40

40 -2y=30

subtract 40 from both sides

-2y=-10

divide by -2

y=5

5 0
3 years ago
Which of the following is not a term in the expression 7 + 2d+ 9f4g+ gh?
9966 [12]
I would say C 9 because the only term with a 9 in it is 9f4g
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3 years ago
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