A biologist wants to know the mean weight of fish in a particular lake. She traps a random selection of 18 fish and weighs each of them. She finds that \( \bar{x}-327 \) grams and \( s=31 \) grams. Construct a \( 90 \% \) confidence interval for the mean weight of fish in the lake. Round the boundaries of the interval to one decimal place. The \( 90 \% \) confidence interval is: Submit Question

1. Estas interesado en detectar diferencias en tiempo promedio de programación de comerciales en horario estelar. Un estudio similar detecto una desviación estándar de 30 minutos. Quisieras calcular una muestra con una confiabilidad del \( 95 \% \) y un error máximo tolerable de 5 minutos en tus estimaciones. ¿Qué tan grande tiene que ser tu muestra?

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

In a class, there are 750 learners in 1st year, 420 learners in 2 nd year. Draw a pie graph to represent the numbers of learners in these groups.

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.

Write down the upper and lower quartiles. Upper Quartile = Lower Quartile = Question 3