In a large random data set following normal distribution, the ratio (% ) of number of data points which are in the range of (mean ± standard deviation) to the total number of data points, is

In a large random data set following normal distribution, the ratio (% ) of number of data points which are in the range of (mean ± standard deviation) to the total number of data points, is
1). ~ 47%
2). ~ 97%
3). ~ 67%
4). ~ 50%

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