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
A. ~ 50%
B. ~ 67%
C. ~ 97%
D. ~ 47%
Answer:B
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
A. ~ 50% B. ~ 67% C. ~ 97% D. ~ 47%