What percentile? score in normal dist. 1 standard dev. above

[staffordsc]

Exam scores were normal in BIO 200. Jason's exam score was one standard deviation above the mean. What percentile is he in?

I do not even know where to begin because it doesnt give the standard deviation...or for that fact any numbers...please help?

 

[Loren]

Re: What percentile??

We know that in a normal distribution the mean is at the 50th %ile. We also know that 68% of the population falls between the mean minus one standard deviation and the mean plus one standard deviation. This means that 34% of the population is between the mean and the mean plus one standard deviation. What percent fall below (all the way to zero) the mean plus one standard deviation? Add 'em up.