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Katyanochek1 [597]
3 years ago
9

The area of a triangle is found using the following formula:

Mathematics
2 answers:
Elena-2011 [213]3 years ago
8 0

Answer:

12 in. 2

Step-by-step explanation:

3 x 8= 24

1/2. =0.5

24 x 0.5 = 12

Paul [167]3 years ago
3 0

Answer:

12 in.^2

Step-by-step explanation:

The formula to find the area of a triangle is as follows:

1/2bh

When the variables are plugged in, you get:

1/2(3)(8)

First, solve the parentheses. 3*8=24.

Next, divide by 2. 24/2=12.

The answer is 12 inches squared, or 12 in.^2 .

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Kendra's backpack weighs 3 1⁄2 pounds. If she removes a book that weighs 13 ounces, how much does the backpack now weigh?
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Answer:

2lb 6oz or 2lb 7oz

Step-by-step explanation:

you would first multiply 3 by 16 which gives you 48 the you add the other 8 oz   which would give you 56 then you subtract the 13 oz to give you 43oz then you divide that by by 16 to give you 2.68 if you dont round up you will get the first answer but if you round you get the second answer

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7. Se llevó a cabo una encuesta de mercado para calcular la proporción de amas de casa que reconocerían el nombre de la marca de
Norma-Jean [14]

Answer:

a) El valor de la proporción de la población = 0.3

b) El intervalo de confianza de 99% de la proporción poblacional = [0.2685, 0.3315]

c) Interprete sus conclusiones.

De los cálculos anteriores, podemos concluir que tenemos un 99% de confianza en que el parámetro de población se encuentra entre 0.2685 y 0.3315 ".

Step-by-step explanation:

a) Halla el valor de la proporción de la población.

El valor de la proporción se calcula mediante la fórmula

p = x / n

donde x = 420

n = número de muestras = 1400

Proporción (p) = 420/1400

= 60/200 = 30/100 = 3/10

= 0.3

b) Construya el intervalo de confianza del 99% para la proporción de población.

La fórmula para el intervalo de confianza para la proporción de población =

p ± z × √p (1 - p) / n

p = 0.3

z = puntuación z para un intervalo de confianza del 99% = 2.576

n = 1400

Por lo tanto:

Intervalo de confianza del 99% = 0.3 ± 2.576 × √0.3(1 - 0.3) / 1400

= 0.3 ± 2.576 × √0.3× 0.7 / 1400

= 0.3 ± 2.576 × 0.0122474487

= 0.3 ± 0.0315494279

Intervalo de confianza del 99% =

0.3 - 0.0315494279

= 0.2684505721

Aproximadamente ≈ 0.2685

0.3 + 0.0315494279

= 0.3315494279

Aproximadamente ≈ 0.3315

Por lo tanto, el intervalo de confianza del 99% = [0.2685, 0.3315]

c) Interprete sus conclusiones.

De los cálculos anteriores, podemos concluir que tenemos un 99% de confianza en que el parámetro de población se encuentra entre 0.2685 y 0.3315 ".

6 0
3 years ago
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