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Find probability value for the given data using normal approximation.

Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4.Estimated the probability that among 75 at random selected students, at least 20 of them score greater than 78.

i.0.0166

ii.0.0239

iii.0.0113

iv.0.1736

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