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siniylev [52]
3 years ago
14

An SRS of size 20 is drawn from a population that has a normal distribution. The sample has a mean of 122.5 and a standard devia

tion of 8. Give the standard error of the mean:______
Mathematics
1 answer:
Tems11 [23]3 years ago
8 0

Answer:

The value is  \sigma_{\= x} = 1.789

Step-by-step explanation:

From the question we are told that

   The sample size is  n =  20  

    The sample mean is \= x = 122.5

    The standard deviation is  s =  8

Generally the standard error of the mean is mathematically represented as

       \sigma_{\= x} =  \frac{s}{\sqrt{n} }

=>    \sigma_{\= x} =  \frac{8}{\sqrt{20 } }

=>    \sigma_{\= x} = 1.789

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schepotkina [342]
If 3 of spades is drawn...and not replaced..

P(next card is spade) = 12/51
P(next card is a king) = 4/51

12/51 + 4/51 = 16/51
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3 years ago
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Jebb is the tallest player on his basketball team. He is 1 1/2 times as tall as the shortest girl in sixth grade, who is 4 1/4 f
skelet666 [1.2K]

Answer:

51/8 or 6 3/8 (depending on if you need to simplify or not)

 Step-by-step explanation:

Since the girl is 4.25 feet tall, you would multiply that by 1.5 which would get you 6.375 then, you convert to a fraction. The fraction would be 51/8 which would be equivalent to 6 3/8. So, Jebb is 6 3/8 feet tall.


Hope this helped! :)


8 0
3 years ago
Math, parent function test,
son4ous [18]

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Step-by-step explanation:

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3 years ago
When you have two shapes to compare on a coordinate plane, you can determine the scale factor, knowing that the transformation w
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Assume that the initial coordinates are (x,y) and that the dilated coordinates are (x',y').

The dilation is therefore:
(x,y) ............> (x',y')

Now, let's assume that the dilation factor is k.
Therefore:
x' = kx
y' = ky

Based on the above, all the student has to do is get the initial coordinates and the final ones and then substitute in any of the above two equations to get the value of k.

Example:
Assume an original point at (2,4) is dilated to coordinates (4,8). Find the dilation factor.
Assume the dilation coefficient is k.
(x,y) are (2,4) and (x',y') are (4,8)
Therefore:
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3 years ago
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Answer:

The perimeter is P=13x-4

Step-by-step explanation:

The perimeter of a triangle is the distance around its edges.

The given triangle has side lengths 5x + 3, 5x – 5, and 3x – 2.

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Group similar terms to get:

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Hence the perimeter in terms of x is P=13x-4

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4 years ago
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