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Slav-nsk [51]
3 years ago
11

How is -25 a rational number?​

Mathematics
1 answer:
Nutka1998 [239]3 years ago
5 0

Answer:

yes

Step-by-step explanation:

because it can be expressed by a quotient

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The mean is <br> A: Sometimes<br> B: always<br> C: never
podryga [215]
I guess the mean is always


this question is not clear.
6 0
2 years ago
How many 15° angles are in a circle?<br> Enter your answer in the box.<br> angles
Alex_Xolod [135]

Answer:

24

Step-by-step explanation:

a circle is 360

we can divide 360 by 15

360 divided by 15 =

24

5 0
2 years ago
The data represented by the graph is normally distributed and adheres to the 68-95-99.7 rule. the standard deviation of this dat
jenyasd209 [6]

Answer:

i)

the standard deviation of this data is 2.2

ii) 84%

Step-by-step explanation:

We have been informed that the data represented by the graph is normally distributed and adheres to the 68-95-99.7 rule. This implies that we shall be dealing with the applications of the empirical rule.

In a normal distribution, the mean is also the mode as well as the median of the distribution. This implies that the mean is at the center of the distribution. In our case, the mean is 4.8. The vertical lines represents data points that lie 1, 2 and 3 standard deviations away from the mean.

From the graph, both 11.4 and -1.8 lie 3 standard deviations away from the mean on either side. We can thus use the following equation to solve for the unknown standard deviation;

mean + 3(sigma) = 11.4

where sigma is the standard deviation.

our mean is 4.8, therefore;

4.8 + 3(sigma) = 11.4

3(sigma) = 6.6

sigma = 2.2

ii)

In order to determine the percentage of the population that will fall below the mark of 7, we shall first determine how many standard deviations away from the mean the value 7 lies.

To do this, we can use the following equation;

4.8 + n(2.2) = 7

2.2n = 2.2

n = 1

Therefore, the data point 7 lies one standard deviation away from the mean to the right.

The percentage of the population that will fall below one standard deviation away from the mean is;

68 + 13.5 + 2.35 = 83.85%

Using the empirical rule

8 0
3 years ago
Which is the simplified form of (9c^-9)-3
Orlov [11]

3[3c^(-9)-1]

hope this helps


5 0
3 years ago
13 What is the value of x? х Enter your answer in the box. 12 X =​
inessss [21]

Answer:

x is the value of 12

Step-by-step explanation:

erfg

3 0
3 years ago
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