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3 years ago

PLEASE HELP ME FAST!!!

Mathematics

2 answers:

yawa3891 [41]3 years ago

6 0

Answer:

ans -------8/5 pansnhshshsh

melamori03 [73]3 years ago

4 0

Step-by-step explanation:

sureeeeeeeeeeeesureeeeeeeeeeee

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blagie [28]

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3 years ago

If a variable stands by itself, what is its coefficient?

Ludmilka [50]

The coefficient would be 1
before every variable, there is a one
So, x is equal to 1x
x+x is 2x
hope this helps:)

8 0

3 years ago

Read 2 more answers

Suppose that the probability density function ofthe length of computer cables is f (x) = 0.1 from 1200 to1210 millimeters.a. Det

Ann [662]

Notice that $f(x)=0.1$ for $1200\le x\le1210$ implies that $f(x)=0$ elsewhere, since

$\displaystyle\int_{1200}^{1210}f(x)\,\mathrm dx=1$

where $X=x$ is a random variable representing cable lengths according to the PDF $f(x)$ .

a. By definition of expectation, the mean is

$E[X]=\displaystyle\int_{-\infty}^\infty x\,f(x)\,\mathrm dx=0.1\int_{1200}^{1210}x\,\mathrm dx=1205$

The variance is

$\operatorname{Var}[X]=E[(X-E[X])^2]=E[X^2]-E[X]^2$

where

$E[X^2]=\displaystyle\int_{-\infty}^\infty x^2\,f(x)\,\mathrm dx=0.1\int_{1200}^{1210}x^2\,\mathrm dx=\frac{4,356,100}3$

so that the variance is $\frac{25}3$ , making the standard deviation $\frac5{\sqrt3}$ .

b. The proportion of cables within specs is

$P(1195$

8 0

4 years ago

The advertising department of a nationally circulated magazine wishes to estimate the mean age of its subscribers within 0.5 yea

zhenek [66]

Answer: Option 'd' is correct.

Step-by-step explanation:

Since we have given that

Margin of error = 0.5 years

Standard deviation = 5

At 90% confidence, z = 1.645

We need to find the minimum size of the sample they must take.

So,

$n=(\dfrac{z\sigma}{E})^2\\\\n=(\dfrac{1.645\times 5}{0.5})^2\\\\n=270.6\\\\n\approx 271$

Hence, Option 'd' is correct.

5 0

3 years ago

1/4 = ?/8 Please help :(

Vilka [71]

Answer:

1/4 = 2/8

Step-by-step explanation:

1/4 = p/8

p = 8/4

p = 2

<em>Follow </em><em>my </em><em>account^</em><em>^</em>

5 0

3 years ago