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3 years ago

Hey all! Pls help They are easy questions, pls show the working

Mathematics

2 answers:

jekas [21]3 years ago

8 0

Answer:

Hello there user, looks like your looking for help!

The correct answers should be:

7. x = 6

8. x = 3 3/4

9. x = -7

Step-by-step explanation:

3/2 = x/4

6/4 = x/4

x = 6

x/3 = 1 1/4

4x/12 = 15/12

x = 15/4

x = 3 3/4

(x + 1)/3 = (x-1)/4

(4x + 4)/12 = (3x-3)/12

x/12 = -7/12

x = -7

UkoKoshka [18]3 years ago

7 0

Answer:

7. x = 6

8. x = 15/4

9. x = -7

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Sati [7]

Usando la distribución hipergeométrica, la probabilidad de que los alumnos del colegio A obtengan los dos premios (no hay empates), es: 0.2 = 20%.

<h3>¿Qué es la fórmula de distribución hipergeométrica?</h3>

La fórmula es:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

$C_{n,x} = \frac{n!}{x!(n-x)!}$

Los parámetros son:

x es el número de éxitos.

N es el tamaño de la población.

n es el tamaño de la muestra.

k es el número total de resultados deseados.

Los valores de los parámetros son:

N = 6, k = 3, n = 2.

La probabilidad de que los alumnos del colegio A obtengan los dos premios (no hay empates), es P(X = 2), por eso:

$P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}$

$P(X = 2) = h(2,6,2,3) = \frac{C_{3,2}C_{3,0}}{C_{6,2}} = 0.2$

Puede-se aprender más a cerca de la distribución hipergeométrica en brainly.com/question/24826394

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4 0

2 years ago

Ps help i dont know maths

satela [25.4K]

Answer:

3526

Step-by-step explanation:

Product means to multiply

3 0

3 years ago

Read 2 more answers

Discussion Explain why 2 < x < 6 can be considered the short method for writing the AND compound inequality x > 2 AND x

nataly862011 [7]

Its much shorter since you changed 2 inequalities into 1 and you made it be 2 in 1

8 0

3 years ago

Data on pull-off force (pounds) for connectors used in an automobile engine application are as follows:

hjlf

Answer:

a) 75.62

b) 75.2

Step-by-step explanation:

Data provided:

79.9,75.1,78.2,74.1,73.9,75.0,77.6,77.3,73.8,74.6,75.5,74.0,74.7,75.9,72.6,73.8,74.2,78.1,75.4,76.3,75.3,76.2,74.9,78.0,75.1,76.8

Sum = 1966.3

Total number of observations, n = 26

a) Mean is given as:

Mean = $\frac{\textup{Sum of all observations}}{\textup{Total number of observations}}$

Mean = $\frac{\textup{1966.3}}{\textup{26}}$

Mean = 75.62

b) For value that separates the weakest 50% of the connectors i.e median or the 50th percentile

Arranging the data in ascending order:

72.6, 73.8, 73.8, 73.9, 74, 74.1, 74.2, 74.6, 74.7, 74.9, 75, 75.1, 75.1, 75.3, 75.4, 75.5, 75.9, 76.2, 76.3, 76.8, 77.3, 77.6, 78, 78.1, 78.2, 79.9

i = $\frac{\textup{n}}{\textup{2}}$

i = $\frac{\textup{26}}{\textup{2}}$ = 13

When the number of observations is even the formula for median is:

$Median = \frac{\frac{n}{2}+\frac{n+2}{2}}{2}$

$Median = \frac{\frac{26}{2}+\frac{26+2}{2}}{2}$

$Median = \frac{13th+14th}{2}$

$Median = \frac{75.1+75.3}{2}$

Median = 75.2

7 0

3 years ago

Find the radius if the diameter of a circle 12 centimeters

mote1985 [20]

ANSWER

My answer is in the photo above

7 0

3 years ago