Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4. Estimate the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
A) 0.1736
B) 0.0113
C) 0.0166
D) 0.0239

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The Answer of Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4. Estimate the probability that among 75 randomly selected students, at least 20 of them score greater than 78.
A) 0.1736
B) 0.0113
C) 0.0166
D) 0.0239

Scores on a Test Are Normally Distributed with a Mean