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Genrish500 [490]
3 years ago
8

Suppose that a normal distribution has a mean of 20 and a standard deviation of 4. What is the z-score of 13?

Mathematics
1 answer:
Papessa [141]3 years ago
5 0

Answer:

-1.75.

Step-by-step explanation:

The z-score = (n - m) / d  where n is the value (13) m = mean and d = standard deviation.

= (13 - 20) / 4

= -1.75  (answer)

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Evaluate the line integral 2 + x2y ds where c is the upper half of the circle x2 + y2 = 1.
goldfiish [28.3K]

Parameterize <em>C</em> by

r(t) = 〈x(t), y(t)〉 = 〈cos(t), sin(t)〉

with 0 ≤ t ≤ <em>π</em>. Then the line integral is

\displaystyle \int_C (2+x^2y)\,\mathrm ds = \int_0^\pi (2+\cos^2(t)\sin(t))\left\|\mathbf r'(t)\right\|\,\mathrm dt \\\\ = \int_0^\pi (2+\cos^2(t)\sin(t)) \,\mathrm dt = \boxed{\frac23+2\pi}

8 0
2 years ago
This is adding and subtracting binomials please help (13 points)
kkurt [141]

Answer:

-5x - 1

Step-by-step explanation:

Step 1: Write expression

(-6x + 2) + (x - 3)

Step 2: Combine like terms

-5x - 1

4 0
3 years ago
The expression that is equal to -10(4x – 5).
notka56 [123]
The best answer to your question would have to be -40x - 50
4 0
2 years ago
What’s the correct answer for this?
goblinko [34]
5x + 34 = -2(1 - 7x)
5x + 34 = -2 + 14x
36 = 9x
x = 4
NO = -2(1 - 7*4)
NO = -2(1 - 28)
NO = -2 + 56
NO = 54
5 0
3 years ago
Read 2 more answers
An n-sided polygon has two of its exterior angles measuring 30° and 42°.The remaining exterior angles all measure 16° each. Find
finlep [7]

Answer:

n = 20.

Step-by-step explanation:

The external angles of a polygon add up to 360 degrees. So:

30 + 42 + 16(n - 2)   = 360   where n is the number of sides of the polygon.

16n + 30 + 42 - 32 = 360

16n  + 40 = 360

16n = 320

n = 20.

5 0
3 years ago
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