Ejemplo 5 Se cree que los C.I. de los niños de escuelas primarias se distribuyen normalmente con una media, de 100 y una varianza de 225 . Si se selecciona aleatoriamente un alumno. Cuál yes la probabilidad de que tenga un C.I. a) mayor de 136, b) menor de 73 y c) entre 85 y 136 ? Que C.I. se tiene hasta el \( 1 \overline{0} .38 \% \).

La duración en horas de cierta marca de bombillos se ajusta a una distribución N(48000, 3000), La duraciōn de los bombillos en un intervalo de confianza del \( 80 \% \) está:

\begin{tabular}{l} Tiempo restante 1:08:08 \\ \hline Una prueba Psicológica a estudiantes de primer semestre de ingreso a la universidad se obtuvo como resultado un puntaje \\ con media de 150 y desviación estándar de 25 puntos. \\ ¿Cual es el porcentaje de alumnos que sacaron al menos 120 puntos? \end{tabular}

men are randomly selected and tested. Among the men, 563 have color blindness, and among the wo lindness than women at an \( \alpha=0.05 \) level of significance. Round all values to at least 4 decimal places.

Question 59 The city of Raleigh has 11,400 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 550 randomly selected registered voters was conducted. 247 said they'd vote for Brown, 284 said they'd vote for Feliz, and 19 were undecided. Use this information from the sample to complete the following statements about the population of all registered voters in Raleigh. Round your answers to the nearest person. Based on this sample, we could expect Based on this sample, we could expect Based on this sample,

Twelve percent of your customers buy 4 desserts. How many desserts can you expect to sell to 500 people?