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2 years ago

Bryan can solve 25 math problems in 30 minutes. At this rate, how many problems can he solve in 1

Mathematics

1 answer:

Ksenya-84 [330]2 years ago

5 0

Answer:

Step-by-step explanation:

25 ----------- 1/2 h (half and hour)

x ------------- 1 h

---------------------------------

25 * 1h = x * 1/2h

25 = x/2

50 = x

he can solve 50 problems in 1 hour

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In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter. Assum

Ludmilka [50]

Answer: 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

Step-by-step explanation:

Confidence interval for population mean ( $\mu$ ) is given by :-

$\overline{x}\pm z \dfrac{\sigma}{\sqrt{n}}$ , where n= sample size, z= critical z-value , $\overline{x}$ = sample mean $\sigma$ = population standard deviation.

Given : n= 36 , $\overline{x}=23$ cubic centimeters per cubic meter.

$\sigma=6.7$ cubic centimeters per cubic meter

For 90% confidence level , z= 1.645 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.645) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 1.837$

$=(23-1.837 , 23+ 1.837)=(21.163, 24.837)$

For 95% confidence level , z= 1.96 [by z-table]

Then, required interval for population mean ( $\mu$ ) would be :

$23\pm (1.96) \dfrac{6.7}{\sqrt{36}}$

$=23\pm 2.189$

$=(23-2.189 , 23+ 2.189)=(20.811, 25.189)$

Hence, 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

5 0

3 years ago

A sword fish ran 60 miles . One mile is equal to 1760 yards. How many yards did the swordfish swim ?

Alenkasestr [34]

It would be 105,600 yards because if you multiply 1760 and 60 you’d get 105,600

8 0

4 years ago

Cheddar cheese cost $4.25 per pound. Which equation best represents y, the total cost of x pounds of cheddar cheese? Group of an

user100 [1]

Answer:

I'm going to edit this later, but do you have the full question?

6 0

3 years ago

Where are my smart friends?? I had $13.00. My Mom gave me $10.00. My Dad gave me $30.00. My Aunt, My Uncle, and grandma gave me

sergiy2304 [10]

Answer:

This would bring you to $160.00. This is because you initially had $20.00, because of the $13 and $7. Then, your family gave you a total of $140.00, and 140 + 20 = 160.

Step-by-step explanation:

3 0

3 years ago

Please help!<br><br> Worth 10 points!

bonufazy [111]

10% of 140 is 14.
to solve you first must do 10/100 = 14/x
cross multiply and you get 10x = 1400
divide 1400 by 10 and you get 140

6 0

3 years ago

Read 2 more answers