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Tju [1.3M]
2 years ago
9

The average tempture for -7 , 2 , -9 , -4 ,and -7

Mathematics
2 answers:
jekas [21]2 years ago
5 0

To find the average, combine all the numbers together and divide by the amount there is.

-7 + 2 - 9 - 4 - 7 = -25

-25/5 = -5

-5 is your average temperature

hope this helps

Sunny_sXe [5.5K]2 years ago
4 0

The answer is -4.2 because you add them all up and then divide them by how there are.

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If ABCD is a square with one side equal to 10 cm what is the length of BD?
goldfiish [28.3K]

Answer:

20

Step-by-step explanation:

10+10+10+10=40

40/2=20

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3 years ago
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What is quotient of a number 21
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A quotient of a number 21 is 3 and 63
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3 years ago
A laptop producing company also produces laptop batteries, and claims that the batteries
gregori [183]

Answer:

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours. (P-value = 0).

The null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

Step-by-step explanation:

<em>The question is incomplete: To test this claim a sample or population standard deviation is needed.</em>

<em>We will estimate that the sample standard deviation is 2 hours, and use a t-test to test that claim.</em>

<em> NOTE (after solving): The difference between the sample mean and the mean of the null hypothesis is big enough to reject the null hypothesis, even when we have a sample standard deviation of 3.5 hours, which can be considered bigger than the maximum standard deviation for the sample.</em>

This is a hypothesis test for the population mean.

The claim is that the batteries power the laptops for significantly less than 4 hours.

Then, the null and alternative hypothesis are:

H_0: \mu=4\\\\H_a:\mu< 4

The significance level is 0.05.

The sample has a size n=500.

The sample mean is M=3.5.

As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=2.

The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{2}{\sqrt{500}}=0.0894

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{3.5-4}{0.0894}=\dfrac{-0.5}{0.0894}=-5.5902

The degrees of freedom for this sample size are:

df=n-1=500-1=499

This test is a left-tailed test, with 499 degrees of freedom and t=-5.5902, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

As the P-value (0) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the batteries power the laptops for significantly less than 4 hours.

5 0
3 years ago
Which value of x makes the equation 0.5(x + 16) = 3 + 0.25(x – 4) true?
Fynjy0 [20]

Answer:it is confusing

Step-by-step explanation:

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3 years ago
You have saved $342$342 and want to go shopping for a few things. You buy a pair of shoes for $73$73, a pair of jeans for $38$38
Xelga [282]
The answer is $162 you take the prices of what she bought and add them together which is $73+$38+$64=$180
then you subtract the $180 from $342 which is $342-$180=$162
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342 - 180 = 162
5 0
3 years ago
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