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3 years ago

15

Question 2.what is the probability that between 80 and 115 complaints are received in one week? use a n(110,20) model to approxi

mate the distribution of weekly complaints.

1 answer:

AURORKA [14]3 years ago

6 0

Calculate standard Z values for the given data:-

z = (80 - 110) / 20 = - 3/2 = -1.5

and z = (115 - 110) / 20 = 0.25

so we need Prob ( -1.5 < z < 0.25)

Using standard tables this comes to 0.5319 Answer

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For one English test, Benny had to answer 15 questions. Of these questionsBenny answered 60% of them correctly. How many questio

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Answer:

9 correct

Step-by-step explanation: 60% of 15 = 9

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2 years ago

Which statements about the hyperbola are true? Check all that apply. A. There is a focus at (0,−10). B. There is a focus at (0,

hichkok12 [17]

Answer:

A. There is a focus at (0,−10).

Step-by-step explanation:

Assume the hyperbola is like the one below.

The hyperbola is vertical and centred on the y-axis, so its general equation is

$\dfrac{y^{2}}{a^{2}} - \dfrac{x^{2}}{b^{2}} = 1$

The vertices of your parabola are (0,±8) so a = 8.

The covertices are (±6,0), so b = 6.

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$\begin{array}{rcl}a^{2} + b^{2} & = & c^{2}\\8^{2} + 6^{2} & = & c^{2}\\64 + 36 & = & c^{2}\\100 & = & c^{2}\\c & = & \mathbf{10}\\\end{array}$

A. Foci

The foci are at (0, ±c) = (0, ±10)

TRUE. There is a focus at (0,-10).

B. Foci

The foci are at (0,±10).

False. There is no focus at (0,12)

C. and D. Asymptotes

The equations for the asymptotes are

$y = \pm\dfrac{a}{b}x = \pm\dfrac{8}{6}x = \pm\dfrac{4}{3}x$

So, y = ±x are not asymptotes.

False.

E. and F. Directrices

The equations of the directrices are

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E is false. x = cannot be a directrix

F is uncertain. Your equation for the directrix is incomplete.

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3 years ago

Please help and explain please. would appreciate it!

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Answer:

Step-by-step explanation:

A/4=72/12

A=4(72)/12

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2 years ago

Read 2 more answers

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1 3 4 4 5 7 8

2 1 2

3 9

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Step-by-step explanation:

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3 years ago

Preston has calculated that his drink coaster has an area of 78.5 square centimeters.What is the coaster’s radius? Use 3.14 for

Alexandra [31]

Answer:

The coaster’s radius is 5 cm

Step-by-step explanation:

Drink Coaster has a circular shape.

Area of a circle = π*r²

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2 years ago