Analyze and solve the following problems: 1. A research student is testing the growth of aloe vera in hydroponics gardening. The average height of the aloe vera is 10.6 cm with standard deviation of 1.3 cm. What is the percentage of aloe vera whose height is between 8.0 cm and 13.2 cm? 2. On average, the coagulation of blood occurs after 10 minutes with standard deviation of 6.5 minutes. What is the percentage of blood samples whose coagulation time last for more than 16.5 minutes? 3. A scientist is testing the effectiveness of guava as a component in filtering waste water. On average, 95 ppm of waste water is being absorbed by the component with standard deviation of 15 ppm. What is the probability that a certain guava component absorbs more than 80 ppm of waste water? 46

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