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svlad2 [7]
2 years ago
13

A test is conducted to compare the tread wear of certain type of tires on highways paved with asphalt and highways paved with co

ncrete. Road tests were conducted with the same type of tires on two types of highways. Summary data on the mileage of the tires up to a certain level of wear are given below.
Sample Size Sample Mean Sample Standard Dev.
Asphalt 35 29,700 25,500
Concrete 35 9,700 7,800
Does this information suggest that tires wear faster on concrete-paved highways than asphalt paved highways?
Mathematics
1 answer:
zimovet [89]2 years ago
4 0

Answer:

Yes it does

Step-by-step explanation:

We can use two sample t-test to draw the conclusuion. However, by looking at the information of mileage of tyres on asphalt and concrete-paved highways, we can say that since mean milege of tyres on concrete is lesser, tyres wear faster on concrete-paved highways.

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Darcie wants to crochet a minimum of 3 blankets to donate to a homeless shelter. Darcie crochets at a rate of 1/15 ​ of a blanke
Gnesinka [82]

Answer:


Step-by-step explanation:

Given that Darcie wants to donate minimum 3 blankets to donate to a homeless shelter.  No of days left =60

No of days to complete one blanket = 1/(1/15) = 15 days

Hence in 60 days she has to complete ≥3 blankets

No of days she has to utilize for this will be ≥3(15)=45

No of days she can skip crocheting ≤15

Let x be the no of days crocheted and y no of days skipped

Then x+y≤60

See the graph attached as x axis for days crocheted and y for days skipped

No of blankets can be either 3 or 4.


4 0
2 years ago
Read 2 more answers
Anna and Hannah have \$80$80dollar sign, 80 each. Their friend offered to invest their money, promising to return a sum rrr time
sergey [27]

9514 1404 393

Answer:

  2r(20r +60) = 80r^2

Step-by-step explanation:

Anna's first investment:

  20

Anna's first return:

  20r

Anna's second investment:

  20r +60

Anna's second return:

  r(20r +60)

__

Hannah's first investment:

  80

Hannah's first return, and her second investment:

  80r

Hannah's second return:

  80r^2

__

Twice Anna's return was equal to Hannah's return:

  2r(20r +60) = 80r^2

7 0
2 years ago
Triangle A B C is shown with its exterior angles. Line C B extends through point D. Line B C extends to form exterior angle that
Valentin [98]

Answer:

ракеп

Step-by-step explanation:

рома баи қшашунон

7 0
1 year ago
The terms of the binomial expansion are written below using the patterns. (m + 2)4 = (1)(m4)(20) + (4)(m3)(21) + (6)(m2)(22) + (
lorasvet [3.4K]

Answer:

(m + 2)^4 = m^4+ 8 m^3 + 24 m^2 + 32 m + 16

Step-by-step explanation:

(m + 2)^4 = (1)(m^4)(2^0) + (4)(m^3)(2^1) + (6)(m^2)(2^2) + (4)(m^1)(2^3) + (1)(m^0)(2^4)

2^0 is 1 also m^0 is 1

2^2= 4, 2^3= 8 , 2^4= 16

(m + 2)^4 = (1)(m^4)(1)+ (4)(m^3)(2) + (6)(m^2)(4) + (4)(m^1)(8) + (1)(1)(16)

(m + 2)^4 = m^4+ 8 m^3 + 24 m^2 + 32 m + 16


4 0
2 years ago
A candy maker estimated that she had 2500 bags of candy. She had put prizes in 92 of them. She collected a sample in which there
Elis [28]
She put prizes in 92 out of 2500 bags. 92/200=0.46.
If 7 bags had candy out of a sample, there were 7/0.46=approximately 15.217 bags of candy in the sample. Or you can say approximately 15.
8 0
2 years ago
Read 2 more answers
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