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Lesechka [4]
2 years ago
5

Last year, during an investigation of the time spent reading e-mails on a daily basis, researchers found that on Monday the aver

age time was 50 minutes. Office workers claim that with the increased spam and junk mail, this time has now increased. To conduct a test, a sample of 25 employees is selected with the following results: sample mean
Mathematics
1 answer:
8090 [49]2 years ago
5 0

The sample mean value is 0.26.

According to the statement we have given that the

Monday the average time was 50 minutes and we have to find the sample mean.

So, the values become

H(not):μ≤50

H(a):μ>50

Right Tail

The significance level, of the given number of employees then

α=0.05

And The value of sample mean, is

Z=x - u/i*(n)^1/2

then the value becomes

Z = 5.6 - 5/1.2*(25)^1/2.

then after calculating

Z= 1.6/1.2*5

Z= 0.26 And

Here The value of sample mean is 0.26.

So, The sample mean value is 0.26.

Learn more about Sample mean here brainly.com/question/12892403

#SPJ4

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Answer:

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Step-by-step explanation:

Because the journey is 120km long, and the mortoristgoes less than 60km per hour.  So in 2 hours, the motorist will go less than 120 km.  So he needs more than 2 hours to go 120 km

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Answer:

71

Step-by-step explanation:

the rule is +5

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What is the slope of the line whose equation is 4x – 6y = 12?
zhannawk [14.2K]
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4x - 6y = 12....subtract 4x from both sides
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(15-5)^3 =??
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(15-5)^3=10^3=10\cdot10\cdot10=1000

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Rectangle ABCD is reflected over the y-axis. What rule shows the input and output of the reflection, and what is the new coordin
scZoUnD [109]

Answer:

As given Rectangle ABCD is reflected over the y- axis.

When a shape or geometrical figure is reflected through a line it's distance that is distance of image from line and distance of Pre-image from that line is always same.Also perpendicular distance of vertices of any polygon that is considered for reflection has same distance from that line after reflection and before reflection.

Suppose the coordinate of A be (x,y) and considering Rectangle A B CD lie in first quadrant then when it is reflected through y - axis that is through the line x=0, it's new coordinate will become A' (-x,y).

If rectangle is in second quadrant having Vertices that is vertices of A (-x,y) then reflected over line that is x=0,→ y axis then Vertices of A' (x,y).

If rectangle is in third quadrant having Vertices that is vertices of A (-x,-y) then reflected over line that is x=0,→ y axis then Vertices of A' (x,-y).

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