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7nadin3 [17]
3 years ago
9

let x represent the number of hours you read a book and y represent the total number of pages you have to read you already read

70 pages and can read 30 pages per hour . write an equarion relating x hours and y pages you read then predict the total nuber of pages you will have read after another 3 hours
Mathematics
1 answer:
MrRa [10]3 years ago
3 0
Given:
x = number of hours
y = total number of pages
70 = number of pages already read
30 =number of pages read per hour

y = 30x

70 = 30x
70/30 = 30x/30
2 1/3 = x

You read 70 pages within 2 hours and 20 minutes.

y = 30x
y = 30(3)
y = 90

An additional 90 pages have been read after another 3 hours.

Total pages read.

y = 30(2 1/3) = 70 pages
y = 30(3)       =<u> 90 pages</u>
                         160 pages within 5 hours and 20 minutes.

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. A study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distr
Gnesinka [82]

We are given the following data:

Sample Size = n = 1000

Sample Mean = u = 15 hours

Population Standard Deviation = s = 2 hours

Since we know the population standard deviation, we can use z distribution to find the confidence interval about the mean. z value for 95% confidence interval is 1.96.

Formula for the confidence interval is:

(u-z\frac{s}{\sqrt{n}} ,  u+z\frac{s}{\sqrt{n}})

Using the values in the formula, we get:

(15-1.96\cdot\frac{2}{\sqrt{1000}},  15+1.96\cdot\frac{2}{\sqrt{1000}})\\ \\  (14.88,15.12)

Therefore, the 95% confidence interval about the population mean is 14.88 hours to 15.12 hours. So B option is the correct answer.

4 0
3 years ago
Read 2 more answers
7.935 x 10 to negative 5 power
Effectus [21]

Answer:

0.00007935

Step-by-step explanation:

7.935 x 10 to negative 5 power can be written as:

7.935 x 10^(-5)

7.935*10^{-5}\\\frac{7.935}{10^5}

A trick to finding 10 to the x power, x is the number of 0's. So 10^5 = 100000

\frac{7.935}{100000}\\

When dividing by tens, move the decimal to the left by the amount of 0's

So our answer is 0.00007935

5 0
3 years ago
Discuss how these two branches of statistics will provide different capabilities and impacts in your engineering discipline. Pro
Makovka662 [10]

Answer:

Key Differences Between Descriptive and Inferential Statistics:

The difference between descriptive and inferential statistics can be drawn clearly on the following grounds:

Descriptive Statistics is a discipline which is concerned with describing the population under study. Inferential Statistics is a type of statistics; that focuses on drawing conclusions about the population, on the basis of sample analysis and observation.

Descriptive Statistics collects, organises, analyzes and presents data in a meaningful way. On the contrary, Inferential Statistics, compares data, test hypothesis and make predictions of the future outcomes.

There is a diagrammatic or tabular representation of final result in descriptive statistics whereas the final result is displayed in the form of probability.

Descriptive statistics describes a situation while inferential statistics explains the likelihood of the occurrence of an event.

Descriptive statistics explains the data, which is already known, to summarise sample. Conversely, inferential statistics attempts to reach the conclusion to learn about the population; that extends beyond the data available.

Ex. Of 350 randomly selected people in the town of Luserna, Italy, 280 people had the last name Nicolussi. An example of descriptive statistics is the following statement :

"80% of these people have the last name Nicolussi."

Ex. Of 350 randomly selected people in the town of Luserna, Italy, 280 people had the last name Nicolussi. An example of inferential statistics is the following statement :

"80% of all people living in Italy have the last name Nicolussi."

We have no information about all people living in Italy, just about the 350 living in Luserna. We have taken that information and generalized it to talk about all people living in Italy. The easiest way to tell that this statement is not descriptive is by trying to verify it based upon the information provided.

6 0
2 years ago
1) Lee y plantea una ecuación que sea útil para resolver cada ecuación.
algol13
9 X 9 X 20 X 20

Pido perdón para mí español, pero creo que este es la ecuación.
8 0
3 years ago
16. An employee has to pay 15.5% in taxes. If
lilavasa [31]

Answer:

379.75

Step-by-step explanation:

15.5 x 2450

100

= 379.75

7 0
3 years ago
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