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IgorC [24]
3 years ago
9

Javed downloaded from the Internet two files that had a combined size of 696 megabytes. The size of the first file was 290 megab

ytes, and it took 5 minutes to download. Assuming that the files downloaded at a constant speed, how long did it take for the second file to download?
2 minutes
4 minutes
7 minutes
12 minutes
Mathematics
2 answers:
vitfil [10]3 years ago
8 0

Answer:

7 minutes I'm pretty sure I'm sorry if I'm not but if I'm right can I have brainliest answer?

Leokris [45]3 years ago
6 0

Answer: I think it's 12

minutes

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The distribution of heights for adult men in a certain population is approximately normal with mean 70 inches and standard devia
KengaRu [80]

Answer:

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12]

Step-by-step explanation:

I beleive those options corresponds to another question, i will ignore them. We want to know an interval in which the probability that a height falls there is 0.8.

In such interval, the probability that a value is higher than the right end of the interval is (1-0.8)/2 = 0.1

If X is the distribuition of heights, then we want z such that P(X > z) = 0.1. We will take W, the standarization of X, wth distribution N(0,1)

W = \frac{X-\mu}{\sigma} = \frac{X-70}{4}

The values of the cumulative distribution function of W, denoted by \phi , can be found in the attached file. Lets call y = \frac{z-70}{4} . We have

0.1 = P(X > z) = P(\frac{X-70}{4} > \frac{z-70}{4}) = P(W > y) = 1-\phi(y)

Thus

\phi(y) = 1-0.1 = 0.9

by looking at the table, we find that y = 1.28, therefore

\frac{z-70}{4} = 1.28\\z = 1.28*4+70 = 75.12

The other end of the interval is the symmetrical of 75.12 respect to 70, hence it is 70- (75.12-70) = 64.88.

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12] .

Download pdf
8 0
3 years ago
The graph of y=f(x) is shown below. Draw the graph of y=-f(x)
valkas [14]

Answer:

y = -f(x): reflection over x axis

Step-by-step explanation:

y = -f(x): reflection over x axis

8 0
2 years ago
L<br> An 8.5 quart jug contains how many cups?
pav-90 [236]

Answer:

34 cups

Step-by-step explanation:

just multiply the value in quarts by the conversion factor 4. So, 8.5 quarts times 4 is equal to 34 cups

3 0
2 years ago
Muriel says she has written a system of two linear equations that has an infinite number of solutions. One of the equations of t
Natalka [10]

Answer:

B is correct

Step-by-step explanation: an infinite number of solutions means a coincident line...it is the same line

3y = 2x - 9...divide by 3

y = 2/3x - 3...hmm...same line as answer choice b....they are coincident lines and have infinite solutions

7 0
3 years ago
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