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Consider X follows uniform distribution with A =-5 and B=7. Calculate P(−2.5≤X≤2.5) 𝑃 ( − 2.5 ≤ 𝑋 ≤ 2.5 ) a. 0.56 b. 0.24 c. 0.42 d. 0.30

Question

Consider X follows uniform distribution with A =-5 and B=7. Calculate P(−2.5≤X≤2.5) 𝑃 ( − 2.5 ≤ 𝑋 ≤ 2.5 )

a. 0.56

b. 0.24

c. 0.42

d. 0.30

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Solution

Para resolver este problema, sigamos los siguientes pasos:

  1. Identificar los parámetros de la distribución uniforme:

    • A=5 A = -5
    • B=7 B = 7
  2. Recordar la fórmula de la función de densidad de probabilidad (f.d.p) para una distribución uniforme: f(x)=1BAparaAxB f(x) = \frac{1}{B - A} \quad \text{para} \quad A \leq x \leq B

  3. Calcular la longitud del intervalo [A,B][A, B]: BA=7(5)=12 B - A = 7 - (-5) = 12

  4. Calcular la probabilidad P(2.5X2.5) P(-2.5 \leq X \leq 2.5) :

    • La longitud del intervalo [2.5,2.5][-2.5, 2.5] es: 2.5(2.5)=5 2.5 - (-2.5) = 5
  5. Usar la fórmula de la probabilidad para una distribución uniforme: P(2.5X2.5)=longitud del intervalo deseadolongitud del intervalo total=512 P(-2.5 \leq X \leq 2.5) = \frac{\text{longitud del intervalo deseado}}{\text{longitud del intervalo total}} = \frac{5}{12}

  6. Calcular el valor numérico: 5120.4167 \frac{5}{12} \approx 0.4167

  7. Redondear a dos decimales: 0.41670.42 0.4167 \approx 0.42

Por lo tanto, la respuesta correcta es:

c. 0.42

This problem has been solved

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