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lilavasa
2 months ago
5

Bob travels from Inglewood to Anytown; a distance of 20 kilometres. He walks 800 metres and cycles the rest of the way. What per

centage of the journey does he travel by bicycle?
Mathematics
1 answer:
tester [12.3K]2 months ago
7 0
We recognize:

800 meters equals 0.8 kilometers,
total distance is 20 kilometers.

If Bob walks 800 meters, then he bicycles the remainder:
19.2 kilometers (20 km - 0.8 km).

Set 20 km as 100%, so 19.2 km corresponds to X%.
Calculate: X = (19.2 × 100) / 20 = 96%.

Therefore, Bob cycles 96% of the journey.
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Harry put blue and green marbles in a bag. Exactly 3/4 of the marbles in the bag are blue. Which of the following could be the t
tester [12383]

Answer:

D

Step-by-step explanation:

When you multiply 3/4 by A, B, or C, it results in a decimal value; however, multiplying 3/4 by 8 yields 6, which is a whole number.

3 0
1 month ago
Read 2 more answers
The manufacturer of hardness testing equipment uses steel-ball indenters to penetrate metal that is being tested, however, the m
Inessa [12570]

Answer:

1.667-2.31\frac{1.803}{\sqrt{9}}=0.2789  

1.667+2.31\frac{1.803}{\sqrt{9}}=3.055  

Based on the analysis, the 95% confidence interval is specified as (0.2789;3.055)  

The question regarding the 95% confidence interval's ability to ascertain potential differences in measurements between the two indenters is as follows:

Indeed, the confidence interval does not include the value 0, thus indicating that the Diamond values significantly exceed those of the Steel Ball at a 5% significance level.

Step-by-step explanation:

Here is the dataset in consideration:

specimen    1     2    3     4      5     6     7    8     9

Steel Ball   51   57   61   70   68   54   65  51   53

Diamond   53   55  63   74   69   56   68  51   56

By calculating the differences between diamond and steel ball measurements, we create the dataset:

d: 2, -2, 2, 4, 1, 2, 3, 0, 3

In the next step, we compute the mean difference  

\bar d= \frac{\sum_{i=1}^n d_i}{n}=1.667

Following that, we determine the standard deviation of the differences, arriving at:

s_d =\frac{\sum_{i=1}^n (d_i -\bar d)^2}{n-1} =1.803

A confidence interval refers to "a range of values that’s likely to encompass a population value with a certain level of confidence. It is typically expressed as a percentage indicating where a population mean falls within an upper and lower limit."  

The margin of error represents the extent to which values diverge above and below the sample statistic in a confidence interval.  

Normal distribution, is described as a "probability distribution that is symmetric about the mean, illustrating that data points close to the mean occur more frequently than those further away."  

The confidence interval for the mean is derived using the following formula:  

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}} (1)  

To calculate the critical value t_{\alpha/2}, we first determine the degrees of freedom using:  

df=n-1=9-1=8  

Given a confidence level of 0.95 or 95%, the appropriate critical value can be found using Excel, a calculator, or a table. The Excel command would be: "=-T.INV(0.025,9)". Therefore, we observe that t_{\alpha/2}=2.31.

Finally, we can substitute all our findings into formula (1):  

1.667-2.31\frac{1.803}{\sqrt{9}}=0.2789  

1.667+2.31\frac{1.803}{\sqrt{9}}=3.055  

In this case, the 95% confidence interval is calculated as (0.2789;3.055)  

In determining if the two indenters yield distinct measurements, we find that the confidence interval does not enclose zero, allowing us to conclude that Diamond readings greatly surpass Steel Ball readings at the 5% significance level.

4 0
17 days ago
In Andrew’s Furniture Shop, he builds bookshelves and tables. Each type of furniture takes him about the same time to make. He f
babunello [11817]
A. The order in which you define the variables isn't fixed. For the sake of this discussion, let's define them like this:

x = Number of bookshelves
y = Number of tables

B. Due to the total number of items to produce, we have the following inequality based on those variables.

x + y > 25

Additionally, you can create a second inequality concerning your budget for materials.

20x + 45y < 675

Moreover, you should also add that both values must not be negative, since you can't produce negative tables.

C. By analyzing the constraints and solving the system, you will find that the feasible region contains 4 vertices.

(0,0)
(18, 7)
(0, 15)
(33.75, 0) or (33, 0) if you prefer to round it. 
8 0
13 days ago
Based on the information below, choose the correct answer.
PIT_PIT [12445]
Hello

the dollar amount of each monthly payment that is interest
11,798.81÷120
=98.32

the percentage of the total payments that is total interest
(11,798.81÷41,798.81)×100
=28.23%

Hope this information is helpful.
3 0
8 days ago
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Alejandro surveyed his classmates to determine who has ever gone surfing and who has ever gone snowboarding. Let A be the event
tester [12383]

Answer:

\text{A and B are independent events}, P(A|B)=P(A)=0.16

Step-by-step explanation:

To establish independence between two events, we must understand the concept of independence:

Events are deemed independent if P(A|B)=P(A), which means that the occurrence of one does not influence the probability of the other event.

In this situation, the only selection that aligns with the independence criterion is P(A|B)=P(A)=0.16. Other options do not comply with the independent events definition.

4 0
1 month ago
Read 3 more answers
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