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LekaFEV [45]
3 years ago
9

The length of a human pregnancy is normally distributed with a mean of 270 days with a standard deviation of 8 days. How many da

ys would a pregnancy last for the shortest 15%? Round answer to 2 decimal places. Answer

Mathematics
1 answer:
solniwko [45]3 years ago
6 0

Answer:

261.71

Step-by-step explanation:

The calculation of days is shown below:-

X = \mu + Z\sigma

where,

Mean = 270

standard deviation is 8

And, the normsinv is -1.036

Now placing these values to the above formula

So, the number of days is

= 270 + (-1.036433389)  × 8

= 270 + (-8.29146711)

= 261.708533

or

= 261.71

Therefore for computing the number of days we simply applied the above formula and for (-1.036433389) please find in the attachment.

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faltersainse [42]

Answer:

\left\{\begin{matrix}39 & x\leq 200\\ 39+(x-200)\times 0.35 & x>200\end{matrix}\right.

Step-by-step explanation:

We are given that Ben has a cell phone plan that provides 200 free minutes each month for a flat rate of $39.

We are also told that For any minutes over 200, Ben is charged $0.35 per minute.

let x  be the minutes used each month

So, if x\leq 200

So, coat will be $39

If x>200

So, Ben is charged $0.35 per minute

So, when x>200

So, charge = 39+(x-200)\times 0.35

So, the piecewise functions accurately represents charges based on Ben's cell phone :

\left\{\begin{matrix}39 & x\leq 200\\ 39+(x-200)\times 0.35 & x>200\end{matrix}\right.

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Candice bought a pencil box, shown below, to take with her to school.
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Answer:

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I NEED HELP!
Vinvika [58]

Answer:

Step-by-step explanation:

First of all you have to put the zeros into factor form.

y1 = (x + 2)(x - 5)

Notice that the x changes sigh. You say that the zeros are -2 and  5. To get y1 to go to zero, you must make x the opposite sign of what you are given.

Now you have to expand the factored form to get the standard form

y = x^2 + 2x - 5x - 10

y = x^2 - 3x - 10

That's not the right answer.

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-3(f(x)) = -3(x + 2)(x - 5)

-3(f(x)) = -3(x^2 - 3x - 10)

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f(0) = -3(0)^2 + 9(0) + 30

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See the graph below.

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Simplify 5b^-8 (Five B to the negative eighth power)
Olenka [21]

Answer:

5

---------

b^8

Step-by-step explanation:

5 b^ -8

We don't like to have negative power

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5

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b^8

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