Answer :
According to the Empirical Rule, approximately 68% of the data in a normal distribution will fall within ±1 standard deviation of the mean.
The correct option is (b)
Empirical Rule:
The empirical rule states that the proportion of values within 1,2, and 3 standard deviations of the mean are approximately 68%, 95%, and 99.7% approximately. It implies majority of the values in a normal distribution lies within 1 standard deviations of the mean.
The Empirical Rule states that for a normal distribution:
About 68% of the data will fall within 1 standard deviation of the mean
About 95% of the data will fall within 2 standard deviations of the mean
About 99.7% of the data will fall within 3 standard deviations of the mean
Therefore, option (b) 68 is the correct answer.
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