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2 years ago

9

The display gives sale prices for 40 houses in Ames, Iowa sold during a recent month. The mean sale price was $203,388 with a st

andard deviation of $87,609. Find the percentile of the house indicated in red on the dotplot

1 answer:

devlian [24]2 years ago

4 0

Answer:

Step-by-step explanation:

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In a standard television set the screen height is 0.75 times the screen width of a television set measures 42 inches along the d

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2 years ago

A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normall

Vlad1618 [11]

Answer: (2.54,6.86)

Step-by-step explanation:

Given : A random sample of 10 parking meters in a beach community showed the following incomes for a day.

We assume the incomes are normally distributed.

Mean income : $\mu=\dfrac{\sum^{10}_{i=1}x_i}{n}=\dfrac{47}{10}=4.7$

Standard deviation : $\sigma=\sqrt{\dfrac{\sum^{10}_{i=1}{(x_i-\mu)^2}}{n}}$

$=\sqrt{\dfrac{(1.1)^2+(0.2)^2+(1.9)^2+(1.6)^2+(2.1)^2+(0.5)^2+(2.05)^2+(0.45)^2+(3.3)^2+(1.7)^2}{10}}$

$=\dfrac{30.265}{10}=3.0265$

The confidence interval for the population mean (for sample size <30) is given by :-

$\mu\ \pm t_{n-1, \alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given significance level : $\alpha=1-0.95=0.05$

Critical value : $t_{n-1,\alpha/2}=t_{9,0.025}=2.262$

We assume that the population is normally distributed.

Now, the 95% confidence interval for the true mean will be :-

$4.7\ \pm\ 2.262\times\dfrac{3.0265}{\sqrt{10}} \\\\\approx4.7\pm2.16=(4.7-2.16\ ,\ 4.7+2.16)=(2.54,\ 6.86)$

Hence, 95% confidence interval for the true mean= (2.54,6.86)

7 0

3 years ago

Find the midpoint of the line segment whose endpoints are the given points. (-24.6, 38.1) and (-25.7, -17.7)

CaHeK987 [17]

Answer:

Midpoint is $(-25.15,10.2)$

Step-by-step explanation:

A line segment refers to line that has two endpoints.

Let $(a,b),(c,d)$ be the endpoints of a line segment.

Midpoint of the line segment is given by $(\frac{a+c}{2} ,\frac{b+d}{2})$

Take the given points as follows:

$(a,b)=(-24.6,38.1)\\(c,d)=(-25.7,-17.7)$

Midpoint of a line segment $=(\frac{-24.6-25.7}{2},\frac{28.1-17.7}{2})$

$=(\frac{-50.3}{2} ,\frac{20.4}{2} )\\=(-25.15,10.2)$

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2 years ago

Please help!! i need math help loll

Murljashka [212]

Answer:

x=3

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers