Percentage of exam scores above two standard deviations above the mean

Join the discussion
Registration is free. Start your own thread to ask a follow-up.
Sign up Log in
1 reply · 2K views
VaneB
Messages
1
Reaction score
0

Homework Statement



The scores on an exam are normally distributed, with a mean of 77 and a standard deviation of 5. What percent of the scores are greater than 87?




Homework Equations





The Attempt at a Solution

I don't understand what it is exactly that I have to do to get the answer. Please Help!
 
Physics news on Phys.org

Discussion

You'll need to use the probability density function or the cumulative distribution function for the normal distribution. Which one?
 

Similar threads

Combine two standard deviations?
  • Addez123
  • · Replies 3 ·
  • Precalculus Mathematics Homework Help
Replies
3
Undergrad More than two standard deviations away from its mean
  • Hiche
  • · Replies 1 ·
  • Set Theory, Logic, Probability, Statistics
Replies
1