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
IgorLugansk [536]
3 years ago
10

Mathematics achievement test scores for 300 students had a mean and a variance equal to 550 and 3,600, respectively. If the dist

ribution of test scores was mound-shaped, approximately how many of the scores would fall in the interval 490 to 610? (Round your answer to the nearest whole number.)

Mathematics
1 answer:
blondinia [14]3 years ago
6 0

Answer:

number of scores between 490 and 610 is = 0.68 x 300 = 204

Step-by-step explanation:

The concept of Probability distribution is applied as it relates to the Z-scores.

Z = X - Mean /Standard deviation

The detailed steps and appropriate substitution is as shown in the attached file.

You might be interested in
Kevin wants to buy an area rug for his living room. He would like the area rug to be no smaller that 48 square feet and no bigge
mariarad [96]

Answer:

8-10 feet

Step-by-step explanation:

If the length of the carpet is two more than the width, the width can be expressed as x and the length can be expressed as x+2. This means that the area(x^2+2x) must be greater than 48 but no less than 80.

Now we can solve for both the maximum and minimum cases:

x^2+2x=48, x^2+2x-48=0, now we can factor, (x+8)(x-6)=0, and now we can use the Zero Product Property to find x=-8;x=6. Since we cant have negative width, x at least has to be equal to 6.

x^2+2x=80,x^2+2x-80=0, now we can factor, (x+10)(x-8), and now using the Zero Product Property to find x=-10;x=8, and since it must be positive, at most x can equal 8.

Now since the length is two more than the width, x, you add two to both of these values and get a range of 8-10 feet.

3 0
4 years ago
-the equations x-y=-14 and -x-y=14 what is the number of solutions? A.) no solutions B.) infinitely many solutions C.) one solut
Yuki888 [10]

Answer:

The answer is C one solution

Step-by-step explanation:

x-y=-14

-y=-x-14  bring x to the other side

y=x+14   divide everything by -1

-x-y=14

-y=x+14  bring x to the other side

y=-x-14  divide everything by -1



6 0
3 years ago
Witch one is greater 21 ft or 17 yd
morpeh [17]
First, you want to find out how many feet in a yard

3ft=1yd

so you do 21/3 to get your yard, and the answer is 7 yard

17 yard is greater than 7 yard so 17 is the answer
7 0
3 years ago
A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which are defective. Step 2 of 2: S
Anna35 [415]

Answer:

The 98% confidence interval for the population proportion of disks which are defective is (0.082, 0.118).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

Suppose a sample of 1536 floppy disks is drawn. Of these disks, 1383 were not defective.

1536 - 1383 = 153

This means that n = 1536, \pi = \frac{153}{1536} = 0.1

98% confidence level

So \alpha = 0.02, z is the value of Z that has a pvalue of 1 - \frac{0.02}{2} = 0.99, so Z = 2.327.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1 - 2.327\sqrt{\frac{0.1*0.9}{1536}} = 0.082

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1 + 2.327\sqrt{\frac{0.1*0.9}{1536}} = 0.118

The 98% confidence interval for the population proportion of disks which are defective is (0.082, 0.118).

6 0
3 years ago
What is the relationship between the 3's in the number 9,338?
Serhud [2]
The 3 in the hundreds place (value of 300) has a value that is 10x the 3 in the tens (value of 30).
4 0
3 years ago
Read 2 more answers
Other questions:
  • Witch of these cannot be a rational number? An integer, an irrational number or a real number
    5·1 answer
  • An aquifer holds 146,000 cubic feet of water. Water exits through a well at a steady rate of 500 cubic feet per day, and the aqu
    8·2 answers
  • Graph the equation 4x−4y=12 using the intercepts.
    13·1 answer
  • Nina has $245 in 5 dollar bills and ten dollar bills. She has ten more 5 dollar bills than ten dollar bills. How many of each ty
    15·1 answer
  • What are the angle measurements of 1,2,3,4, &5?
    11·1 answer
  • Triangle ABC has vertices at A(-2.3), B(-3, -6), and C(2, -
    9·2 answers
  • Help! Picewise function problem
    5·1 answer
  • Solve for the variable.
    8·1 answer
  • Solve: |2(x-5)|+11=17​
    8·1 answer
  • Each side of the square below is 8 inches. A triangle inside of a square. The top of the triangle divides a side of the square i
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!