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Lelechka [254]
3 years ago
5

Suppose that a police officer measured the speed of cars on a highway for an hour. The average speed of the cars was 71.3 and th

e standard deviation was 5.23. However, since the radar gun was biased, 4.9 is added to every observation in the dataset. What will the new standard deviation be?
Mathematics
1 answer:
ad-work [718]3 years ago
6 0

Answer:

The new mean is 76.2

Step-by-step explanation:

Given

Given  

Old mean = 71.3

Every observation is increased by 4.9.  

Let the data set has N entries, then

The new mean would be  

(71.3 *N + 4.9*N)/N

The new mean  = 71.3 + 4.9 = 76.2

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What is the answer to this expression 0.6(d+3)=3d
Sloan [31]

Answer:

d = 3/4

Step-by-step explanation:

divide 0.6 both sides

d+3 = 5d

4d = 3

d = 3/4

8 0
3 years ago
-1/5 plus 7/10 <br><br> Whats the answer ??/
lubasha [3.4K]

Answer:

Hi Friend!

The Correct Answer is 1/2

Step-by-step explanation:

The fractions have unlike denominators. First, find the Least Common Denominator and rewrite the fractions with the common denominator.

LCD(-1/5, 7/10) = 10

Multiply both the numerator and denominator of each fraction by the number that makes its denominator equal the LCD. This is basically multiplying each fraction by 1.

3 0
3 years ago
Consider the dataset below and respond to the questions that follow: Advertisement ($'000) Sales ($'000) 1068 4489 1026 5611 767
8_murik_8 [283]

Answer:

The scatter plot is attached in the image

There exists a positive linear relationship between the two variables i.e sales and advertisements.

Step-by-step explanation:

The scatter plot is attached in the image

There exists a positive linear relationship between the two variables i.e sales and advertisements.

3 0
3 years ago
A grandmother says that her grandson is two years older than her granddaughter and that together they are at least 12 years old.
HACTEHA [7]

Answer:

her grandson would be 7 and her granddaughter would be 5.

Step-by-step explanation:

their ages together is 12. we divide that by the two grandchildren, and adjust it to where they are to years apart.

12÷2=6

6+6 + adjusted = 5 and 7.

to fact check 5+7=12, and 7 is two numbers above 5.

7 0
3 years ago
If f(x) is an even function and (6, 8) is one the points on the graph of f(x), which reason explains why (–6, 8) must also be a
Levart [38]
An even function implies f(x) = f(-x)
We know that if (6,8) is a point on the graph, then f(6) = 8
By definition, f(6) = f(-6) = 8
So (-6, 8) is also a point on the graph.
7 0
4 years ago
Read 2 more answers
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