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Alekssandra [29.7K]
3 years ago
11

Suppose a normal distribution has a mean of 50 and a standard deviation of

Mathematics
2 answers:
grandymaker [24]3 years ago
7 0

Then standardize the two scores

48 and 52

to be able to consult the table.

The formula for changing a raw score x into a z score is

Z=X−μσ.

For this problem, X is normal with

μ=50 and σ=5.

So, by symmetry of the standard normal curve,

P(48<X<52)

=P(48−50<X−50<52−50)

=P(48−505<X−505<52−505)

=P(−25<Z<25)

=P(−.40<Z<.40)

=P(Z<.40)−P(Z<−.40)

=P(Z<.40)−P(Z>.40)

=P(Z<.40)−(1−P(Z<.40))

=2P(Z<.40)−1

=2(.6554)−1

=1.3108−1

=.3108≈.31

=31%.

hoa [83]3 years ago
5 0

Answer:

27.8% I think

Step-by-step explanation:

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BAHO PEPE

Step-by-step explanation:

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ValentinkaMS [17]
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3 years ago
Select the correct answer.
BaLLatris [955]

Answer:

80

Step-by-step explanation:

in the figure above, angle 100 degrees is corresponding to the angle co - interior to angle x

that is

if we put an angle that is at the upper left of x, we can call that y which is corresponding to 100 degrees

since y is corresponding to 100 degrees, it automatically becomes the same as 100 degrees

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now, from the first line above, we know that x and y are co-interior which means that they both add up to 180 degrees

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therefore,

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collect like terms and

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therefore,

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7 0
3 years ago
The function f(x) = (x - 4)(x - 2) is shown.
agasfer [191]

Answer:

all real numbers greater than or equal to -1

Step-by-step explanation:

In order to solve this problem we need to know the vertex and the direction its pointing.

First we expand,

x^2-6x+8

To find the x value of the vertex we use this formula (-b/2a).

-(-6)/2(1) = 3

Now we plug 3 in the equation to get the y value,

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We know the graph points up because x^2 is positive

The vertex is the lowest point, so we now know that -1 is the starting range and if the graph is pointing up, that means all values greater than -1.

This leads to our answer all real numbers greater than or equal to -1.

6 0
3 years ago
Tera buys 10 pencils for $1.99.<br> About how much $ does each pencil<br> cost?
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Answer:

19 cents or 0.199

Step-by-step explanation:

Hope it helped!

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