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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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the dot plot above identifies the number of pets living with each of 20 families in an apartment building .what fraction of fami
harkovskaia [24]

Answer:

B. ⅕

Step-by-step explanation:

Fraction of families having more than 2 pets = families with pets of 3 and above ÷ total number of families in the apartment

From the dot plot above, 3 families have 3 pets, and 1 family has 4 pets.

Number of families with more than 2 pets = 3 + 1 = 4

Fraction of families with more than 3 pets = \frac{4}{20} = \frac{1}{5}

4 0
2 years ago
What is the greatest whole number that will divide both 792 and 990 exactly
Nastasia [14]
Factor the numbers, starting from the smallest:
792=2*3*3*11*4
990=2*3*3*11*5
the greatest whole number that can be divided by both 792 and 990 is 2*3*3*11=198
the smallest whole number that can divide both 792 and 990 exactly is 2*3*3*11*4*5=3960

Not sure which one you are asked to find. 
8 0
2 years ago
Read 2 more answers
A satellite in a 100-mile-high circular orbit around Earth has a velocity of approximately 17,500 miles per hour.If this velocit
AveGali [126]

Answer:

64.3 miles ( D)

Step-by-step explanation:

Circular orbit height ( from the center of the earth ) = 100 mile

angle between satellite and earth = 50°

escape velocity = √2 * 17500 =  24748.73 miles /hour

distance between surface of earth and satellite

x = cos ∅

∴ Cos ∅  = x / 100

x = cos 50° * 100   ≈ 64.3 miles

3 0
2 years ago
Lori recently quit her job and decided to start her own company, which will sell makeup to small beauty salons. What should she
skad [1K]

She should "Decide how to price her product". Which is response B.

This is because all the other options don't really make sense. You can't advertise something that you don't even know how much it costs. We've also already decided what the company sells. And we can't decide where the product will be sold unless we have made up the price for the product!

Hope this helps!

3 0
2 years ago
A bike wheel is 26 inches in diameter. What is the bike wheel's diameter in millimeters (1 inch = 25.4 millimeters)?
ruslelena [56]

Answer:

Diameter of wheel in millimetres is 660.4

Step-by-step explanation:

Diameter of wheel in inches = 26

given

1 inch = 25.4 millimeters

multiplying RHS and LHS by 26

26*1 inch = 26*25.4 millimeters

=>26 inch = 660.4 mm.

Thus, diameter of wheel in millimetres is 660.4

3 0
2 years ago
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