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Fudgin [204]
3 years ago
10

Which of the following is a true equation?

Mathematics
2 answers:
leonid [27]3 years ago
7 0
Your correct answer is your firs option. i hope this hel<span>ped

</span>
KIM [24]3 years ago
4 0
<span>4 + 3 - 3 = 7 - 3
           4 = 4

answer

</span><span>3) 4 + 3 - 3 = 7 - 3</span>
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The average mass of a giraffe is approximately 1x 10^8 kilograms. The average mass of a blue whale is approximately 2x 10^6 kilo
Basile [38]

Answer:

Giraffe = 1,000 kg

Whale = 2,000,000 kg

Step-by-step explanation:

Whale has 2,000 times the mass.

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Please help!
balu736 [363]
I think the answer is B) i’m not 100%
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3 years ago
Need help ASAP!!!!!!!!!!!!!!!!!!!!!!!!!
il63 [147K]

Answer:

d

Step-by-step explanation:

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5 0
3 years ago
Reflect the point (-20,4)
Firdavs [7]
Refrection of (-20, 4) across x-axis gives (-20, 4) = (-20, -4)

Refrection of (-20, 4) across y-axis gives (20, 4)

Refrection of (-20, 4) across y = -x gives (20, -4)

Refrection of (-20, 4) across y = 7 gives (20, 10)
4 0
3 years ago
Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.5
masya89 [10]

Answer:

z= \frac{3.44-2.54}{0.45}=2

P(X>3.44) = P(Z>2) = 0.025

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

Let X the random variable that represent the grade points avergae of a population, and for this case we know the following properties

Where \mu=2.54 and \sigma=0.45

The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all data falls within three standard deviations (denoted by σ) of the mean (denoted by µ). Broken down, the empirical rule shows that 68% falls within the first standard deviation (µ ± σ), 95% within the first two standard deviations (µ ± 2σ), and 99.7% within the first three standard deviations (µ ± 3σ).

So we can find the z score for the value of X=3.44 in order to see how many deviations above or belowe we are from the mean like this:

z= \frac{3.44-2.54}{0.45}=2

So the value of 3.44 is 2 deviations above from the mean, so then we know that the percentage between two deviations from the mean is 95% and on each tail we need to have (100-95)/2 = 2.5% , because the distribution is symmetrical, so based on this we can conclude that:

P(X>3.44) = P(Z>2) = 0.025

5 0
3 years ago
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