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Harrizon [31]
2 years ago
12

Amanda earned a score of 940 on a national achievement test that was normally distributed. The mean test score was 850 with a st

andard deviation of 100
If 1000 students took the test, how many scored below Amanda? Use z table.
Mathematics
2 answers:
SVETLANKA909090 [29]2 years ago
7 0

Answer:

<h3><u>L</u><u>o</u><u>w</u><u>e</u><u>r</u><u> </u><u>t</u><u>h</u><u>a</u><u>n</u><u> </u><u>A</u><u>m</u><u>a</u><u>n</u><u>d</u><u>a</u> : 816 students.</h3>

hichkok12 [17]2 years ago
6 0

Answer:

lower than Amanda:  816 students

Step-by-step explanation:

An equivalent way in which to state this problem is:  Find the area under the standard normal curve to the left (below) 940.

Most modern calculators have built in distribution functions.

In this case I entered the single command   normalcdf(-1000,940, 850, 100)

and obtained 0.816.

In this particular situation, this means that 0.816(1000 students) scored lower than Amanda:  816 students.

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Which would be used to solve this equation? Check all that apply.
puteri [66]

Answer:

multiplying both-side of the equation by 3

substituting 36 for p to check the solution

Step-by-step explanation:

To solve the equation p/3 = 12, we will follow the steps below;

first multiply 3 to both-side of the equation, that is:

p/3 × 3 = 12 × 3

On the left-hand side of the equation, 3 at the numerator will cancel-out 3 at the denominator, leaving us with just p while on the right-hand side of the equation 12 will be multiplied by 3

p= 36

To check the correctness of the equation, we can substitute p = 36 back into the equation and then check, that is;

p/3 = 12

36/3 = 12

This implies p = 36 is correct

3 0
3 years ago
Which of the following statements about the function cannot be used to conclude that is defined at x = 1?
Murljashka [212]
A Lin x —>1 f(x) exists
3 0
3 years ago
A 40 inch board is to be cut into three pieces so that the second price is 4times as long as the first piece and the third piece
Anastasy [175]

Answer:

Step-by-step explanation:

Givens

Let the first piece be x

Let the second piece 4x

Let the third piece = 5x

Total length = 40 inches.

Equation

x + 4x + 5x = 40                Combine

Solution

10x = 40                             Divide by 10

10x/10 = 40/10        

x = 4

Answer

The smallest piece (x) = 4

The middle piece 4x  = 4*4 = 16

The largest piece 5x= 5 * 4 = 20

3 0
1 year ago
What is the value of s in the equation 3r = 10 + 5s, when r = 10?
kupik [55]
S = 4

3(10) = 10 + 5s
30 = 10 + 5s
30 - 10 = 5s
20 = 5s
20 ÷ 5 = s
4 = s
4 0
3 years ago
Read 2 more answers
The complete set of common factors of 6 and 12 is:
trapecia [35]
The complete set of common factors of 6 and 12 is D. {1,2,3,6}
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3 years ago
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