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2 years ago

8.4kg plus 3.25kg equals

Mathematics

1 answer:

igomit [66]2 years ago

4 0

Answer:

11.65kg

Step-by-step explanation:

8.4kg + 3.25kg

11.65kg

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A random sample of 300 Americans planning long summer vacations in 2009 revealed an average planned expenditure of $1,076. The e

Rufina [12.5K]

Answer:

$(1024.69,\ 1127.31)$

Step-by-step explanation:

We know that the sample size was:

$n = 300$

The average was:

${\displaystyle {\overline {x}}}=1,076$

The standard deviation was:

$\s = 345$

The confidence level is

$1-\alpha = 0.99$

$\alpha=1-0.99\\\alpha=0.01$

The confidence interval for the mean is:

${\displaystyle{\overline {x}}} \± Z_{\frac{\alpha}{2}}*\frac{s}{\sqrt{n}}$

Looking at the normal table we have to

$Z_{\frac{\alpha}{2}}=Z_{\frac{0.01}{2}}=Z_{0.005}=2.576$

Therefore the confidence interval for the mean is:

$1,076\± 2.576*\frac{345}{\sqrt{300}}$

$1,076\± 51.31$

$(1024.69,\ 1127.31)$

This means that the mean planned spending of all Americans who take long summer vacations in 2009 is between $ 1024.69 and $ 1127.31

3 0

2 years ago

In 1996, only 193 people owned cellphones in metropolis. Each year, cell phone use has continuously grown by 58%. How many cellp

zubka84 [21]

A = 193e^(0.58*12)
A = 203351 people

6 0

3 years ago

Read 2 more answers

Which system of inequalities is represented by the graph? A) A B) B C) C D) D

yKpoI14uk [10]

Answer:

Step-by-step explanation:

It is not A or B because the line is not dotted.

It is not B or D because y should be greater than x

So it is C

5 0

2 years ago

Becki put some stamps into her stamp collection book she put 14 stamps on each page if she completely filled 16 pages how many s

aleksandrvk [35]

Answer:

224 stamps.

Step-by-step explanation:

We have been given that Becki put 14 stamps on each page.

To find the total number of stamps that Becki put in the book we will multiply the number of stamps put on each page by the number of completely filled pages.

$\text{The total number of stamps in the book}=14\times 16$

$\text{The total number of stamps in the book}=224$

Therefore, Becki put 224 stamps in the book.

7 0

2 years ago

If (x − 2) ∶ 5 = 7 ∶ 9, then find the value of x.

WARRIOR [948]

Answer:

x=53/9

Step-by-step explanation:

(x-2):5=7:9

9x-18=35

9x=35+18

9x=53

x=53/9

4 0

2 years ago