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Rom4ik [11]
3 years ago
5

In a room there are 9 boys and 12 girls the ratio of girls to boys is

Mathematics
2 answers:
denis-greek [22]3 years ago
4 0

Answer:

The ratio is 12:9

Step-by-step explanation:

12 girls to 9 boys

12 to 9

12:9

zhannawk [14.2K]3 years ago
3 0

Answer: 12 to 9


Step-by-step explanation:


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A tablet PC contains 3217 music files. The distribution of file size is highly skewed with many small files. Suppose the true me
m_a_m_a [10]

Answer:

Let X the random variable who represents the file sizeof music. We know the following info:

\mu =2.3,\sigma =3.25

We select a sample of n=50 nails. That represent the sample size.  

Since the sample size is large enough n >30, we can use the central limit theorem. From this theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

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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 central limit theorem states that "if we have a population with mean μ and standard deviation σ and take sufficiently large random samples from the population with replacement, then the distribution of the sample means will be approximately normally distributed. This will hold true regardless of whether the source population is normal or skewed, provided the sample size is sufficiently large".

Let X the random variable who represents the file sizeof music. We know the following info:

\mu =2.3,\sigma =3.25

We select a sample of n=50 nails. That represent the sample size.  

Since the sample size is large enough n >30, we can use the central limit theorem. From this theorem we know that the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And we can approximate the distribution of the sample mean as a normal distribution and no matter if the distribution for X is right skewed or no.

8 0
3 years ago
2) If Silas added 5 years to his age he would be 39. How old is Silas now? Write as an equation and solve.
Fofino [41]
Here's the equation:
5 + x=39
-5        -5

Here's the answer: x=34
6 0
3 years ago
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Solve. −3/5x +1/5 > 7/20
Reika [66]
-3/5x + 1/5 > 7/20
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-3/5x > 7/20 - 4/20
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x < 3/20 * - 5/3
x < -15/60 reduces to -1/4

3 0
3 years ago
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Lisa paid $48.25 for 16.7 gallons of gasoline. What was the cost per gallon, rounded to the nearest
vlabodo [156]
$2.89 Just do the cost divided by the gallons and round up.
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