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exis [7]
3 years ago
6

A telephone number consists of seven digits, the first three representing the exchange. how many different telephone numbers are

possible within the 537 exchange? the answer is .
Mathematics
1 answer:
AveGali [126]3 years ago
8 0
Since the first three digits are 537 (the exchange), we have 7-3=4 digits left. In each of those digits, there are 10 possible numbers, 0 to 9. As there are 10 numbers possible for the first digit, there are 10 numbers for each number for the second digit, and so on. For example, if the first digit was 1, we would have 1___ (3 blanks) with each blank having 10 possibilities. As there are 10 possibilities for the second number if the number 1 is there, there are 10 possibilities for the second digit for each number possible for the digit, getting 10*10=100 possible combinations with only two numbers. The same applies to the third and fourth blank, as if the second number is 2, there are 100 possibilities for 12__ (2 blanks) to be a possibility, and there are 10 blanks for each possible combination of the first two numbers, getting 10*10*10=10^3=1,000 possible combinations. Repeat the process for the fourth digit, and you end up with 10,000 possible combinations.

Feel free to ask further questions!
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Write a declaration for a variable rate_of_pay that can hold values like 11.50 or 12.75.
hichkok12 [17]

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2 years ago
Los puntajes obtenidos por un grupo de alumnos en un examen de 10 puntos son 3,5,2,6,5,9,5,2,8,6. Para saber el puntaje máximo q
Vikentia [17]

Answer:

Para saber el puntaje máximo que obtuvo el 75% de los alumnos se debe calcular el tercer cuartil.

Step-by-step explanation:

Los Cuantiles (cuartiles, deciles, percentiles) son medidas de localización cuya  función es informar del valor de la variable que ocupará la posición (en tanto por  cien) que interese respecto de todo el conjunto de variables.

Los cuartiles son medidas estadísticas de posición que tienen la  propiedad de dividir la serie estadística en cuatro grupos de números iguales de  términos.

El primer cuartil o cuartil inferior es aquel valor de la variable tal que la cuarta parte (25%) de las observaciones son inferiores o iguales a él, y el resto (75%) es superior o igual. El segundo cuartil es la mediana, ya que se trata del valor localizado en la mitad de la distribución. Finalmente, el tercer cuartil o cuartil superior es un valor tal que las tres cuartas partes de las observaciones son inferiores o iguales a él.

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<u><em>Para saber el puntaje máximo que obtuvo el 75% de los alumnos se debe calcular el tercer cuartil.</em></u>

<u><em></em></u>

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