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 (d) 68%
The Empirical Rule is a statistical rule of thumb that describes the approximate proportions of data that fall within a certain number of standard deviations from the mean in a normal distribution.
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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