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Alexxandr [17]
3 years ago
6

The length of time a particular smartphone's battery lasts follows an exponential distribution with a mean of ten months. A samp

le of 64 of these smartphones is taken. Find the probability that the sample mean is between seven and 11.
Mathematics
1 answer:
aev [14]3 years ago
8 0

Answer:

Probability between 7 and 11 is 0.7799

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NEED HELP! ASAP! 50 POINTS!
Lerok [7]

Answer:

y=13\text{ miles per gallon}

Step-by-step explanation:

We have the two points: (0, 11) and (3, 50).

And we want to find the rate of change in y relative to x, where x is the gallons and y is the miles.

In simple terms, we want to find the slope between the two points.

So, let's use the slope formula:

m=\frac{y_2-y_1}{x_2-x_1}

Let (0, 11) be (x₁, y₁) and let (3, 50) be (x₂, y₂). Substitute. Let's also put "miles" in the numerator with the Ys and "gallons" in the denominator with the Xs. This yields:

y=\frac{50-11\text{ miles}}{3-0\text{ gallons}}

Subtract and reduce:

y=39\text{ miles}/3\text{ gallons}=13\text{ miles per gallon}

And we're done!

6 0
3 years ago
A rectangle is 12m longer than it is wide. Its perimeter is 68m. Write and equation and show steps to find its length and width.
Galina-37 [17]

Answer:

  length: 23 m; width: 11 m.

Step-by-step explanation:

The perimeter of a rectangle is twice the sum of its length and width, so that sum is 34 m. Then you can write two equations in length and width:

  l + w = 34

  l - w = 12

Adding these together gives you ...

  2l = 46

  l = 23 . . . . . . divide by 2

Then the width is

  w = 23 -12 = 11

The length and width are 23 m and 11 m, respectively.

4 0
3 years ago
Someone who actually knows what they doing please ‍♀️
Firdavs [7]

Answer:

-2/5

Step-by-step explanation:

2(4a+1)=3a

Expand parentheses:

8a+2=3a \\\\5a=-2 \\\\a=-\dfrac{2}{5}

Hope this helps!

6 0
3 years ago
Read 2 more answers
Need help ASAP midterm <br> - 40 points .
evablogger [386]

Answer:

how do you want me to help you with

Step-by-step explanation:

8 0
3 years ago
<img src="https://tex.z-dn.net/?f=5%5E%7B-2%7D" id="TexFormula1" title="5^{-2}" alt="5^{-2}" align="absmiddle" class="latex-form
nirvana33 [79]

Answer:

0.08

Step-by-step explanation:

5^-2 is equal to 1/25 or 0.04.

Cube root of 8 is 2.

3 0
3 years ago
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