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Find the probability that based on the normal distribution.

The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces.

What proportion of items will weigh between 6.4 and 8.9 ounces?

i) 0.1145

ii) 0.2881

iii) 0.1736

iv) 0.4617

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