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3 years ago

PLEASE HELP ILL MARK BRAINLIEST

Mathematics

1 answer:

lorasvet [3.4K]3 years ago

3 0

Answer:

2 hours = 1,100

6 hours = 3,300

Step-by-step explanation:

divide 1,650 by 3 hours and get 550 as the average miles traveled per hour

times 550 by the hours desired and get you answer

hope this helps!!

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A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were det

iragen [17]

Answer:

The correct option is d

Step-by-step explanation:

From the question we are told that

The sample size is n = 64

The mean is $\= x = 320$

The standard deviation is $\sigma = 120$

Generally the standard error of the mean is mathematically represented as

$\sigma_x = \frac{\sigma}{ \sqrt{n} }$

=> $\sigma_x = \frac{120}{ \sqrt{64} }$

=> $\sigma_x =15$

7 0

3 years ago

A supplier of a certain car parts chain of stores wants to estimate the average length of time car owners plan to keep their car

____ [38]

Answer:

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.575*\frac{6.5}{\sqrt{25}} = 3.35$

The lower end of the interval is the sample mean subtracted by M. So it is 7.2 - 3.35 = 3.85 years

The upper end of the interval is the sample mean added to M. So it is 7.2 + 3.35 = 10.55 years

The 99% confidence interval for the average length of time all car owners plan to keep their cars is between 3.85 years and 10.55 years.

7 0

3 years ago

Mia can purchase a 40 ounce jar of peanut butter for $5.20 or a 15 once jar for 2.70. how much does mia save per ounce by buying

melomori [17]

Cost per ounce for the 40-ounce peanut butter is
$5.20/40 = $0.13
cost per ounce for the 15-ounce peanut butter is
$2.70 / 15 = $ 0.18
Mia saves 5 cents or $0.05

7 0

4 years ago

The equation 8c = $40.80 represents the cost of 8 t-shirts, with c representing the cost of one t-shirt. How much do 5 t-shirts

Hunter-Best [27]

Answer:

To find the price of one t-shirt, we can do 40.80 / 8 = $5.10 per shirt. Therefore, the price of 5 shirts is 5.10 * 5 = $25.50.

4 0

3 years ago

Help.......Due soon and I will give 35 points and brainliest but if you give answers like idk i just want point... I WILL REPORT

Nataly [62]

Answer:

1. a.Double bond

2. d.6

3 d.A low boiling point

4. (I dont know)

5. b.False

7. a.True

8. a.True

9. a.True

10. b.False

11. a. alloys are often stronger and less reactive than pure metals

12.c. an attraction between positive ions and electrons

13.c. good thermal insulator

14. b. solid

15.a. metallic

16. a.high

17.a. thermal

18.a. ductile

19. a.electrical

20. a.valence electrons

Step-by-step explanation:

6 0

3 years ago