A dealer advertises that a certain brand of tire averages 50,000 miles of use before needing to be replaced. Testing this claim, an investigator finds that a sample of 19 randomly selected tires from this dealer had an average lifespan of 48,700 miles with a standard deviation of 4,500 miles. Assume tire life spans are approximately normally distributed. At the α = 0.05 level, find if the investigator can prove the dealer is exaggerating the average lifespan of their tires by performing the hypothesis test.

Answer:

-75

Step-by-step explanation:

-|-50|-|-25|

-50-25=-75

Answer: 0.42%.

Step-by-step explanation:

Probability of (M(Eligible Men)) = 0.52

Probability of (W(Eligible Women)) = 1 - 0.52

= 0.48

Probability of (UM(Unemployed Men)) = 0.088

Probability of (UW(Unemployed Women)) = 0.070.

therefore;

Probability that the worker is a man = [P(UM)*P(M)]/[P(UM)*P(M) + P(UW)*P(W)] = 0.576613

0.088 * 0.52 )/ 0.088 * 0.52 + 0.070 * 0.48

= 0.04576 / 0.07936

= 0.5766

probability that the randomly selected worker is both female and unemployed is

= 1 – 0.58%

= 0.42%

Answer:

10+10x-3x>17

10+7x>17

7x>17-10

7x>7

x>1

Hope it helps:-)

Answer:

No

Explanation:

The unit rates are not the same.

Answer:

I believe it's D. (3,4)

Step-by-step explanation:

A equals 3, and after plugging that in and simplifying, you're left with B=4.

Hope this helps!

Answer:

b = 4

Step-by-step explanation:

Answer:

It's a mnemonic device to help you remember the three basic trig ratios used to solve for missing sides and angles in a right triangle. It's defined as: SOH: Sin(θ) = Opposite / Hypotenuse. CAH: Cos(θ) = Adjacent / Hypotenuse.

Answer:

SOH CAH TOA is a mathmatical acronym used in triginometry. It helps find missing angels and sides of a triangle.

Step-by-step explanation:

Sine = Opposite side over Hypotenuse         ---> SOH

Cosine = Adjacent side over Hypotenuse       ---> CAH

Tangent = Opposite side over Adjactent          ---> TOA

You use SOHCAHTOA to find the angle. You use the inverses to find the measures.

Answer:

Step-by-step explanation: 21/70

Answer: the answer is

42/140

or

3/10

Answer:

sqrt(24)

Step-by-step explanation:

The square root of 24 is between 4 and 5 since we know that 4 square is 16 and 5 squared is 25.  16 < 24 < 25.

Cheers.

Answer:

4,-3

Step-by-step explanation:

div g gbc sti ri us fila ru has slap

Answer:

n = 1/8

Step-by-step explanation:

2n-1/4=0

Add 1/4 to each side

2n-1/4+1/4=1/4

2n = 1/4

Divide each side by 2

2n/2 = 1/4 * 1/2

n = 1/8

Answer:

Step-by-step explanation:

Krulik, Stephen; Rudnick, Jesse A.

Problem Solving: A Handbook for Elementary School

Teachers.

ISBN-0-205-11132-7

88

249p.; Drawings may not reproduce well.

Allyn & Bacon/Logwood Division, 160 Gould Street,

Needham Heights, MA 02194-2310 ($35.95, 20% off 10 or

more).

Guides - Classroom Use - Guides (For Teachers) (052)

MF01 Plus Postage. PC Not Available from EDRS.

*Cognitive Development; Curriculum Development;

Decision Making; Elementary Education; *Elementary

School Mathematics; Expert Systems; *Heuristics;

Instructional Materials; Learning Activities;

Learning Strategies; Logical Thinking; Mathematical

Applications; Mathematics Materials; Mathematics

Skills; *Problem Sets; *Problem Solving

This book combines suggestions for the teaching of

problem solving with activities and carefully discussed non-routine

problems which students should find interesting as they gain valuable

experience in problem solving. The over 300 activities and problems

have been gleaned from a variety of sources and have been classroom

tested by practicing teachers. Topics included are an explanation of

problem solving and heuristics, the pedagogy of problem solving,

strategy games, and non-routine problems. An extensive rumber of

problems and strategy game boards are given. A 50-item bibliography

of problem solving resources is included. (Author/MVL)

V=⅓πr²h

V=⅓*π*(100)²*6

V=188495.56

3

V=62831.85cm³

Answer:

600 cm2

Step-by-step explanation:

Area of base of cone (A) = 100 cm2

h = 6 cm

Now,

V = A × h

= 100 × 6 = 600 cm2

Answer:

99.9453% of matter in the ore is neither diamond or copper

Step-by-step explanation:

First add  0.0297 and 0.025

0.0297+0.025=0.0547

Now subtract 0.0547 from 100

100-0.0547=99.9453

99.9453% of matter in the ore is neither diamond or copper

Hope this helps! Plz award Brainliest : )

Answer:2 and 3 and 5

Step-by-step explanation:

Answer:

answers 2,3,5 are correct

Step-by-step explanation:

Answer:

hope this helped you

please mark as the brainliest (ㆁωㆁ)

Step-by-step explanation:

6x - 5y -3z=15 ...................(1)

2x - 3y - 4z =2 ...................(2)

Answer:

im pretty sure its c-no the corresponding sides are not proportional

Step-by-step explanation:

Answer:

x = -2

Step-by-step explanation:

6(x+7)=30

6x+42=30

6x=-12

x=-2

Step-by-step explanation:

Hey there!!

According to the question,

One number is 7.

Let another no. be x.

So, the condition is 6(x+7)= 30

Now,

6(x+7) = 30

6x +42 = 30

6x = 30-42

[tex]x = \frac{ - 12}{6} [/tex]

Therefore the no. is -2.

Check,

6(-2+7)= -12 + 42 = 30 { they gets subtracted but sign remains (+) only }.

Hope it helps....

Answer:

C

Plug in all numbers to table and find the correct answers. Use coordinating x and y numbers

Answer:

BC=1

Step-by-step explanation:

Answer:

Positive; P increases

Step-by-step explanation:

When gasoline prices go up, the demand for push lawn mowers increases, so the sign of the cross-elasticity is positive.

If gasoline prices go up, and demand for push lawn mowers goes up, then the price for push lawn mowers will also go up.

Answer:

.85

Step-by-step explanation:

just divide 17 by 20

Answer:

0.85 or .85

Step-by-step explanation:

Hope this helps.!!111111

YW

Answer:

Step-by-step explanation:

Given the expression  |x|=a, we must understand that  |x| can return both positive and negative value of x i.e

x=a and -x = a

from the second equation,

-x = a

multiply both sides by minus

-(-x) = a

x = -a

Hence If "a" is negative number according to the question then the  equation has one solution which renders the fact that the equation has no solution if a is negative false.

Answer:

3(x + 4)- X= 12

Step-by-step explanation:

Answer:

x = 11

Step-by-step explanation:

        Simplify [tex]2(x-3)+7[/tex]

        Apply the distributive property.

[tex]2x - 6 + 7= 23[/tex]

[tex]2x+1=23[/tex]

         Move all terms not containing  x  to the right side of the equation.

         Subtract  1  from both sides of the equation.

[tex]2x =23-1[/tex]

[tex]2x=22[/tex]

          Divide each term by  2  and simplify

[tex]\frac{2x}{2} = \frac{22}{2}[/tex]

          Cancel the common factor of  2

[tex]x = \frac{22}{2}[/tex]

          Divide 22 by 2

[tex]x = 11[/tex]

No 4 is not a solution of the equation becouse it would be an inproper solution

Answer:

90 stands

Step-by-step explanation:

1/3 x 3 = 1.

30 x 3 = 90.

The answer is 90. I hope this helps!