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LuckyWell [14K]
3 years ago
6

The observations of 124.53, 124.55, 142.51, and 124.52 are obtained when taping the length of a line. What should the observer c

onsider doing before a mean length is determined from the set of observations?
Mathematics
1 answer:
mylen [45]3 years ago
6 0

Answer: the observer should consider to eliminate or to retake the third measure.

Explanation:

The four measures taken are 124.53, 124.55, 142.51 and 124.52.

As it can be easily seen, the third measure is much different from the other three. This means that something went wrong during the observation: it can be either the measure taken wrong or that the number was written wrong (if you switch the 2 and the 4 you get a number similar to the other ones).

If the third measure is not considered, an estimate of the mean would place it around 124.5, while if the outlier (the detatched number) is considered an estimate of the mean would increase to about 129.

Therefore, in order to obtain a more reliable mean, the observer should consider to eliminate or to retake the third measure.

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A recent survey of 1090 U.S. adults selected at random showed that 623 consider the occupation of firefighter to have very great
REY [17]

Answer:

0.572

Step-by-step explanation:

From the question,

We have

n = 1090 of US adults

x = 623 selected from this population at random who consider the occupation to be one of great prestige

So we have that

The probability of X = x/n

= 623/1090

= 0.572

We conclude that 0.572 is the probability that a US adult selected at random thinks the occupation has great prestige.

7 0
3 years ago
Roberto wants to reduce a drawing that is 12 inches long by 9 inches wide. If his new drawing is 8 inches long, how wide will it
Bess [88]

Answer: It would be 6 inches wide.


Step-by-step explanation: Well two thirds of 12 in. is 8in. So  two thirds of 9in. would be 6 inches.


6 0
3 years ago
Read 2 more answers
F equals to 2 f - 20​
ICE Princess25 [194]

Answer:

20

Step-by-step explanation:

f = 2f - 20

f - 2f = - 20

- f = - 20

f = 20

7 0
3 years ago
A radio transmission tower is 170 feet tall. how long should a guy wire be if it is attached 15 feet from the top and is to make
beks73 [17]
The image of the given scenario is attached below.

A right angled triangle is formed, with one angle equal to 27 degrees. The perpendicular side is 155 and we are to find the length of guy wire which makes the hypotenuse of the right angled triangle.

Using the formula of sine, we can write:

sin(27)= \frac{155}{x}  \\  \\ 
x= \frac{155}{sin(27)} \\  \\ 
x=341

Rounding to nearest whole number, the length of the guy wire that must be attached is 341 feet. 

5 0
3 years ago
(Algebra II) Which equation is best represented by the graph above?
kodGreya [7K]
<h3>Answer:</h3>

B). y = (x -3)(x +1)(x -1)

<h3>Step-by-step explanation:</h3>

The zeros of the function are -1, 1, and 3, so the factors are (x +1), (x -1), and (x -3).

Selection B is the only choice that has these three factors.

_____

<em>Comment on zeros and factors</em>

When x = a is a zero of a polynomial function, (x -a) is a factor.

5 0
3 years ago
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