1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
frutty [35]
3 years ago
12

Nhà trường muốn đánh giá tỉ lệ chăm học của sinh viên (trong một tuần). Khảo sát 236 sinh viên thì thấy có 32 sinh viên chăm học

. Hãy ước lượng khoảng đối xứng cho tỉ lệ sinh viên chăm học của trường với độ tin cậy 95%
Mathematics
1 answer:
drek231 [11]3 years ago
4 0

Answer:

can't understand the language

You might be interested in
Starting at the same point at the same time, Samuel and Heather rode their bikes in the same direction. Samuel traveled 3km/h fa
12345 [234]

Samuel was going with 40 km/h and Heather was going with 37 km/h

Step-by-step explanation:

Starting at the same point at the same time, Samuel and Heather rode their bikes in the same direction

  • Samuel traveled 3 km/h faster than Heather
  • After 3.5 h Samuel stopped for a half-hour break, but Heather kept going
  • Heather was 8 km ahead of Samuel

We need to find how fast each was going

Assume that Heather's speed is x km/h

∵ Heather's speed = x km/h

∵ Samuel traveled 3 km/h faster than Heather

∴ Samuel's speed = x + 3 km/h

The formula of the distance is distance = speed × time

∵ Samuel travel for 3.5 hours

- Find the distance that Samuel traveled in 3.5 h

∴ Samuel distance = (x + 3) × 3.5

- Multiply the bracket by 3.5 to simplify

∴ Samuel distance = 3.5x + 10.5

∵ Samuel took a break for half hour

∵ Heather kept going

∵ At the end of the break, Heather was 8 km ahead of Samuel

- That means Heather was going for 4 hours (3.5 + 0.5), and her

   distance is longer than Samuel distance by 8 km

∴ Heather distance = x × 4 = 4x

- Subtract the distance of Samuel from the distance of Heather

   and equate the difference by 8

∵ 4x - (3x + 10.5) = 8

∴ 4x - 3x - 10.5 = 8

- Add the like terms in the left hand side

∴ 0.5x - 10.5 = 8

- Add 10.5 to both sides

∴ 0.5x = 18.5

- Divide both sides by 0.5

∴ x = 37

∵ x represents Heather's speed

∴ Heather's speed = 37 km/h

∵ x + 3 represents Samuel's speed

∴ Samuel's speed = 37 + 3 = 40 km/h

Samuel was going with 40 km/h and Heather was going with 37 km/h

Learn more:

You can learn more about the equation of motion in brainly.com/question/568302

#LearnwithBrainly

3 0
3 years ago
Michelle buys a rug for $36 and sells it for $90. What was the value of her markup, expressed as a percent?
Rama09 [41]
Her markup was about 60%.
4 0
3 years ago
Read 2 more answers
Add: <br> 3x+9+8x + 12<br> 2x + 6+x² + 6x + 9
Oxana [17]

I'll treat these like they're two seperate problems because  how you set it up they're not together. If it's one whole problem please tell me and I'll solve it that way. :-)

First one: 3x+9+8x + 12

Collect like terms and simplify

(3x+8x)+(9+12)

11x+21

Second one: 2x + 6+x² + 6x + 9

Collect like terms and simplify

(2x+6x)+(6+9)+x^{2}

8x+15+x^{2}

Hope this helps you, have a BLESSED and wonderful day, as well as a safe one!

-Cutiepatutie ☺❀❤

6 0
3 years ago
Write 9.3 million in scientific notation
svetoff [14.1K]

9.3 × 107 would be the scientific notation

3 0
3 years ago
Read 2 more answers
Please someone helpppppppppppppppp I’m stuck &gt;:(
IceJOKER [234]
The first part is 1325

10 x 35=350

15 x 65=975

The you add them which equals 1325
6 0
3 years ago
Read 2 more answers
Other questions:
  • Part B
    15·1 answer
  • What is the percent decrease between 80 and 64
    6·2 answers
  • The resulting R'ST' is an example of what kind of transformation?
    12·1 answer
  • Answer to this problem
    14·1 answer
  • The difference between 4,632 and 20,000 is what number?
    8·2 answers
  • What fraction is more than 0 but less than 4/10? Idk if I am even asking the question correctly!
    5·1 answer
  • An urn contains 2 small pink balls, 7 small purple balls, and 6 small white balls.
    9·1 answer
  • Simplify the following expression.
    9·2 answers
  • Please help find the central angle and perimeter !
    10·1 answer
  • Greta has 8 stickers. She splits them evenly among e envelopes. Write an expression that shows how many stickers are on each env
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!