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Aleksandr [31]
3 years ago
13

Score data from a statewide exam for 10th-graders follows a normal distribution, has a mean of 77, and has a standard deviation

of 6.5.
According to the Empirical Rule, 34% of test scores fall into what range? Select all that apply.

Below 70.5

Below 70.5 and above 83.5

Between 70.5 and 77

Below 77

Between 77 and 83.5

Above 77

Above 83.5
Mathematics
1 answer:
Oduvanchick [21]3 years ago
6 0

Answer:

Below 70.5 because of the 68, 95, and 97.5 rule

Step-by-step explanation:

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Which number is in the solution set of the inequality -5x - 7 > 28?
Vanyuwa [196]

Answer:

x>-7

Step-by-step explanation:

A

7 0
1 year ago
A bakery is having a sale on cupcakes. At 11am the bakery has sold 123 cupcakes. By 2pm the bakery has sold 470 cupcakes.
Wittaler [7]

Answer:

The average rate of change is 115 cupcakes per hour approximately

Step-by-step explanation:

6 0
2 years ago
4. Tell whether the systems have one solution,
hjlf

Answer:

x= 2,

,y = 5

Step-by-step explanation:

Solve by Substitution :

// Solve equation [1] for the variable y

[1] y = 5x - 5

// Plug this in for variable y in equation [2]

[2] -4x + 2•(5x-5) = 2

[2] 6x = 12

// Solve equation [2] for the variable x

[2] 6x = 12

[2] x = 2

// By now we know this much :

x = 2

y = 5x-5

// Use the x value to solve for y

y = 5(2)-5 = 5

Solution :

{x,y} = {2,5}

5 0
2 years ago
How do you simplify -4+(-1)-(-3)
Elanso [62]

Answer:-2

Explanation:

-4-1-(-3)

=-5-(-3)

=-2

Hope this helps :)

8 0
3 years ago
Read 2 more answers
Calcula y comprueba las ecuaciones: plisss lo necesito alguien me puede ayudar a) 2X = 6 b) 10 + Z = 20 c) P + 9 = 11 d) 3X + 8
vesna_86 [32]

Answer:

a) x=3

b) z=10

c) P= 2

d) X=7

e) U=1

Step-by-step explanation:

Resolver una ecuación consiste en hallar los valores de la variable que hacen cierta la igualdad.

a) 2x= 6

El coeficiente es el número junto a la variable. En este caso, el coeficiente es 2. Para eliminar este número en la expresión 2x, debido a que la variable x esta multiplicada por 2, deberás dividir ambos lados de la ecuación entre 2, debido a que la operación opuesta de la multiplicación es la división.

(2x)÷2=6÷2

x= 3

Comprobar la solución de una ecuación se hace al remplazar la variable en una ecuación con el valor de la solución. La solución debería satisfacer la ecuación cuando se ingresa en esta.

En este caso:

2*3= 6

6=6

b) 10 + z= 20

En este caso se debe sumar o restar la constante que se encuentra acompañando a la variable en ambos lados de la ecuación de manera de aislar el término de la variable. En este caso:

10 - 10 + z= 20 -10

z= 10

Comprobación:

10 + z=20

10 + 10=20

20=20

c) P + 9= 11

P +9 - 9= 11 -9

P=2

Comprobación:

2 + 9= 11

11=11

d) 3X + 8 = 29

En este caso, se suma o resta la constante en ambos lados de la ecuación y luego se elimina el coeficiente de la variable mediante la división o multiplicación. Esto es:

3X + 8 - 8= 29 - 8

3X= 21

3X ÷3= 21÷3

X=7

Comprobación:

3*7 + 8=29

21+8=29

29=29

e) 2U + 8= 10

2U + 8 - 8= 10 -8

2U= 2

2U ÷2= 2÷2

U=1

Comprobación:

2*1 + 8= 10

2 + 8= 10

10=10

8 0
2 years ago
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