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4 years ago

On the most recent district-wide math exam, a random sample of students earned the following scores:

Mathematics

1 answer:

kirza4 [7]4 years ago

3 0

Answer:

mean=80.833

median=84.5

Step-by-step explanation:

scores:

95,45,37,82,90,100,91,78,67,84,85,85,82,91,93,92,75,84,100,59,92,77,68,88

we arrange the scores in ascending order

37,45,59,67,68,75,77,78,82,82,84,84,85,85,88,90,91,91,92,92,93,95,100,100

mean=sum of all observations/total number of observations

= 1940/24

=80.833

median is the central tendency of all observations

median lies between 84 and 85

median=(84+85)/2

= 84.5

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X + y + z = 30. 2x + 3y + 4z = 100. Find the value of x, y and z

Luba_88 [7]

There are infinitely many solutions for x, y and z.

By elimination, we have

(2x + 3y + 4z) - 2 (x + y + z) = 100 - 2•30

⇒ y + 2z = 40

and

(2x + 3y + 4z) - 3 (x + y + z) = 100 - 3•30

⇒ -x + z = 10

If we let z = t for some real number t, then

y + 2z = 40 ⇒ y = 40 - 2t

-x + z = 10 ⇒ x = t - 10

so any solution to the system is a point belonging to the set

$\left\{ (t-10,40-2t,t) \mid t\in\mathbb R\right\}$

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2 years ago

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nika2105 [10]

29 = 160 - x

x = ?

160 - 29 = 131

SO x = 131

Check:-

160 - 131 = 29

SO,

29 = 160 - 131.

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3 years ago

Square root X less than or equal to 10

BigorU [14]

Answer:

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3 years ago

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ololo11 [35]

Answer:

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Step-by-step explanation:

In the relationship between the confidence interval and hypothesis, it is stated that:

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Now, If the value of the parameter specified by the null hypothesis falls inside the given confidence interval, then we will fail to reject the null hypothesis at the corresponding significance level. However, If the value specified by the null hypothesis doesn't fall inside the given confidence interval, then the null hypothesis can be rejected at the corresponding significance level.

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erica [24]

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y = 3x + 3

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y = 1/2x + 3

y = 3x + 1/2

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This leaves us with

y = 3x + 3 and y = 1/2x+3

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I chose (2, 4), (0, 3)

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3 years ago