Question

Help please! The grades received by 200 students follow a normal distribution. The mean of the grades is 70%, and the standard deviation is 7%. The number of students who received a grade greater than 70% is about? and the number of students who got a grade higher than 84% is about?

Answer 1

Multiply 50% by 200 = 100
The number of students who received a grade greater than 70% is about 100, because 50% of the data is above the mean.
100% - 95% = 5%
(%5)2 = 2.5%
2.5 of 200 people is 5 people.