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EJERCICIOS PROPUESTOS.
UNIDAD I
1.- Los puntos medios o marcas de clase de una distribución de frecuencias con intervalos de igual anchura son: 46, 55, 64, 73, 82 y 91 halle:
El ancho del intervalo:
i = Ls - Li +1
i = 91 - 46 + 1
i = 46
Los intervalos de clase:
Xm = (Ls + Li) / 2
Xm = ( 91 + 46 ) / 2
Xm = 68,5
Los límites reales de cada intervalo:
i = 91,5 - 45,5
i = 46
2.- El número de alumnos reprobados en una escuela durante los últimos 10 años se expresa en la siguiente tabla, determinar:
Las frecuencias relativas y acumuladas.
Los porcentajes de las frecuencias y frecuencias acumuladas.
X | f | % fr | fa | %fa |
1990-1991 | 3 | 6,521739 | 3 | 6,52000 |
1991-1992 | 4 | 8,695652 | 7 | 15,21565 |
1992-1993 | 2 | 4,347826 | 9 | 19,56348 |
1993-1994 | 3 | 6,521739 | 12 | 26,08522 |
1994-1995 | 7 | 15,217391 | 19 | 41,30261 |
1995-1996 | 1 | 2,173913 | 20 | 43,47652 |
1996-1997 | 14 | 30,434783 | 34 | 73,91130 |
1997-1998 | 1 | 2,173913 | 35 | 76,08522 |
1998-1999 | 4 | 8,695652 | 39 | 84,78087 |
1999-2000 | 7 | 15,217391 | 46 | 99,99826 |
Total datos | 46 | 100,00 | | |
Obtenga las notas de matemáticas de un curso X de uno de los trimestres, utilizando intervalos adecuados halle:
La marca de clase o punto medio.
La frecuencia relativa y acumulada.
Los porcentajes de la frecuencia y la Frecuencia acumulada.
Los productos de fXm y la sumatoria.
Sugerencia de calificaciones:
16 | 15 | 13 | 20 | 18 | 19 | 15 | 13 | 20 | 16 |
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Enviado por: | Victor Arellano |
Idioma: | castellano |
País: | Ecuador |