Question: 6. It's found that the mean and standard deviation in the fluoride concentration in a water treatment plant are 1.18ppm and 0.27ppm, respectively. If we

6. It's found that the mean and standard deviation in the fluoride concentration in a water treatment plant are 1.18ppm and 0.27ppm, respectively. If we sample the water from the plant, calculate the probability that the fluoride concentration is: (a) Larger than 1.45 ppm. (3 marks) (b) Between 0.729 and 1.091 (4 marks) (c) Smaller than 0.729

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