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3 years ago

15

There are four more girls than boys in Ms. Raub's class of 28 students. What is the ratio of number of girls to the number of bo

ys in her class?

1 answer:

Alex73 [517]3 years ago

8 0

16:12

Subtract 4 from 28 then divide by 2.

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a car rent is $240 per week plus $1.00 per mile. Find the rental cost for a two week trip of 500 miles for a group of three peop

tankabanditka [31]

Answer:

I'm not sure if you mean each person has a car for 2 weeks and travels 500 miles each but if so the rental cost is $2,940.

If it is just one car for all 3 people the rental cost is $980

Step-by-step explanation:

renatl cost = r

weeks = w

miles = m

the equation would be r = $240w + $1m

and if there are 3 people you mulitply the answer by 3

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3 years ago

A teacher was interested in knowing the amount of physical activity that his students were engaged in daily. He randomly sampled

klasskru [66]

Answer:

The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}$

The sample is [30mins, 40 mins, 60 mins, 80 mins, 20 mins, 85 mins]. The size of the sample is n=6.

The mean of the sample is:

$\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5$

The standard deviation of the sample is calculated as:

$s=\sqrt{\frac{1}{n-1}\sum (x_i-\bar x)^2} \\\\ s=\sqrt{\frac{1}{5}\cdot ((30-52.5)^2+(40-52.5)^2+(60-52.5)^2+(80-52.5)^2+(20-52.5)^2+(85-52.5)^2}\\\\s=\sqrt{\frac{1}{5} *3587.5}=\sqrt{717.5}=26.8$

Then, we can calculate the standard error of the mean as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}=\frac{26.8}{6}= 4.5$

6 0

3 years ago

How do I solve this problem? 0.3v = 1.35

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Divide each side of the equation by 0.3 .

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3 years ago

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siniylev [52]

Answer:

4

Step-by-step explanation:

4^2=8 8^2=64

4^3=64

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3 years ago

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Please help me with this

dusya [7]

The numbers below are cut off. Can you please add another picture

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2 years ago