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3 years ago

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the scores on a psychology exam were normally distributed with a mean of 56 and a standard deviation of 9. A failing grade on th

e exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score?

1 answer:

bija089 [108]3 years ago

3 0

hey! i got a failing grade! this world is so small.

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Infinite limits algebraic

Komok [63]

Answer:

B is your answer

Step-by-step explanation:

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3 years ago

The product of 10 and a number, plus 12 is 52. What is the number?

Law Incorporation [45]

10x + 12 = 52
10x = 52 - 12
10x = 40
10x / 10 = 40 / 10
x = 4

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3 years ago

Find the vertex of the function given below. y = x2 - 4x + 1

DedPeter [7]

The vertex is (2, -3).
Use the formula x= -b/2a to find the x value., which is 2.Then, substitute it into the function, wherever you see an x. Follow order operations and you get y, which is -3.

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3 years ago

Read 2 more answers

Back to my question. I have this problem that I cant solve.

vesna_86 [32]

Answer:

Step-by-step explanation:

-21-9k=-8(6k+3)

-21-9k= 48k+24

+9k +9k

-21=57k+24

-24 -24

-45=57k

divide 57 by -45

k= -1.2

idk if that helps, sorry

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3 years ago

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A lampshade has a height of 12cm and upper and lower diameters of 10cm and 20cm A)what area of material is required to cover tha

netineya [11]

Answer:

$(a)\ Area = 195\pi$

$(b)\ Volume = 700\pi$

Step-by-step explanation:

Given

$h = 12$

$d_1 = 10$ --- lower diameter

$d_2 = 20$ --- upper diameter

Solving (a): The curved surface area

This is calculated as:

$Area = \pi l(r_1 + r_2)$

Where

$r_1 = 0.5 * d_1 = 0.5 * 10 = 5$ --- lower radius

$r_2 = 0.5 * d_2 = 0.5 * 20 = 10$ --- upper radius

And

$l = \sqrt{h^2 + (r_1 - r_2)^2$ ---- l represents the slant height of the frustrum

$l = \sqrt{12^2 + (5 - 10)^2$

$l = \sqrt{12^2 + (-5)^2$

$l = \sqrt{144 + 25$

$l = \sqrt{169$

$l = 13$

So, we have:

$Area = \pi l(r_1 + r_2)$

$Area = \pi * 13(5 + 10)$

$Area = \pi * 13(15)$

$Area = 195\pi$

Solving (b): The volume

This is calculated as:

$Volume = \frac{1}{3}\pi * h * (r_1^2 + r_2^2 + (r_1 * r_2))$

This gives:

$Volume = \frac{1}{3}\pi * 12 * (5^2 + 10^2 + (5 * 10))$

$Volume = \frac{1}{3}\pi * 12 * (25 + 100 + (50))$

$Volume = \frac{1}{3}\pi * 12 * (175)$

$Volume = \pi *4 * 175$

$Volume = 700\pi$

6 0

3 years ago