Answer:
1. About 68% of the data lie within one standard deviation of the mean.
2. About 95% of the data lie within two standard deviation of the mean.
3. About 99,7% of the data lie within three standard deviation of the mean.
Step-by-step explanation:
1. 34 + 34 = 68
2. 68 + 13,5 + 13,5 = 95
3. 95 + 2,35 + 2,35 = 99,7
