Social & Preventive Medicine

Systolic BP of a group of 200 people follows normal distribution. Mean BP is 120 mm Hg and standard detion 10. Which of the following is true-

68% of people have BP between 110-130 mm Hg

95% of people have BP between 110-130 mm Hg

68% of people have BP between 100-140 mm Hg

99% of people have BP between 100-140 mm Hg