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Eduardwww [97]
3 years ago
5

An experiment involves selecting a random sample of 256 middle managers at random for study. one item of interest is their mean

annual income. the sample mean is computed to be $35,420 and the sample standard deviation is $2,050. what is the standard error of the mean?
Mathematics
1 answer:
Nitella [24]3 years ago
7 0
The standard error of the mean is 128.125.

The formula for standard error is:

\sigma_M=\frac{\sigma}{\sqrt{N}}

With our information, we have:

\sigma_M=\frac{2050}{\sqrt{256}}=128.125.
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What is the sum of the multiples of 5 from 1 to 100, inclusive
iragen [17]
0, 5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100 stoopid
8 0
3 years ago
What is the solution to the linear equation? 2.8y + 6 + 0.2y = 5y – 14 y = –10 y = –1 y = 1 y = 10
svp [43]

2.8y + 6 + 0.2y = 5y – 14

Simplify the left side:

3y +6 = 5y-14

Subtract 3y from both sides:

6 = 2y -14

Add 14 to each side:

2y =20

Divide both sides by 2:

y = 20 / 2

y = 10

5 0
3 years ago
Read 2 more answers
Let A and B be subsets of a universal set U and suppose n(U)=400, n(A)=135, n(B)=80, and n(A n B)=60. Find the number of element
Alexxandr [17]
Use A' for A complement, etc. and n = intersection ∩.
n(A' n B')
=n(A u B)'   by the de Morgan's law
=nU-n(nA+nB-n(AnB))     n(A u B) = nA + nB - n(AnB)  and nX'=nU-nX
=400-(135+80-60)
=400-155
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5 0
3 years ago
Solve using order of operations (9 + 33 – 6 ) ÷ 6 – 32
marusya05 [52]

Answer:

-26

Step-by-step explanation:

9+33-6

calculate the sum of the positive numbers

42-6

subtract the numbers

36 divided by 6-32

6-32

-26

5 0
3 years ago
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Which ordered pair is the best estimate for the solution of the system of equations?
Rasek [7]

Answer:

<u>The ordered pair of the solution is (0.022, -0.55). None of the alternatives given we can consider as the best estimate because there isn't at least one positive value for x, when it's actually positive. Picking (0, -2) as the best estimate is also far from the best estimate.</u>

Step-by-step explanation:

Let's solve the system of equations:

y = −25x

−2y = 5x+1

***********************

Substituting y in the 2nd equation:

-2 (-25x) = 5x + 1

50x = 5x + 1

45x = 1

x = 1/45

x = 0.022

**********************

Solving for y in the 1st equation:

y = -25 (0.022)

y = - 0.55

<u>The ordered pair of the solution is (0.022, -0.55). None of the alternatives given we can consider as the best estimate because there isn't at least one positive value for x, when it's actually positive. Picking (0, -2) as the best estimate is also far from the best estimate.</u>

6 0
3 years ago
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