**Lets say the mean of an exam is 70% with a standard deviation of 5. The distribution is normal. Your score is an 80%. Approx what % of the class did better than you?
a)14%
b)2%
c)20%
d)98%
e)50%
I know the answer is 2%, but why?
**A new measure of IQ is normally distributed with a mean of 10 and a standard deviation of 1.0. based on what you know about normal distribution, we should expect that 95% of all scores will fall between
a)a score of 9 and score of 11
b)70 and 130
c)8 and 12
d)1 and 10
e)impossible to tell from this information
a)14%
b)2%
c)20%
d)98%
e)50%
I know the answer is 2%, but why?
**A new measure of IQ is normally distributed with a mean of 10 and a standard deviation of 1.0. based on what you know about normal distribution, we should expect that 95% of all scores will fall between
a)a score of 9 and score of 11
b)70 and 130
c)8 and 12
d)1 and 10
e)impossible to tell from this information