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The amount of growth, in a 15-day period, for a population of sunflower plants was found to follow a normal distribution with a mean of

The amount of growth, in a 15-day period, for a population of sunflower plants was found to follow a normal distribution with a mean of 3.18 cm and a standard deviation 0.53 cm. What percentage of plants grow

(a) 4 cm or more?

(b) 3 cm or less?

(c) between 2.5 and 3.5 cm?

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