SOLUTION: Please help I have been working on this problem for the last hour...I am so confused...Thank you for your time its greatly appreciated A set of data is normally distributed with

Question 487044: Please help I have been working on this problem for the last hour...I am so confused...Thank you for your time its greatly appreciated
A set of data is normally distributed with a mean of 100 and standard deviation of 15. SHOW ALL WORK
What would be the standard score for a score of 115?
What percentage of scores is between 100 and 115?
What would be the percentile rank for a score of 115?

Answer by John10(297) (Show Source): You can put this solution on YOUR website!
Use the formula z = (X - M)/s.d
a) z = (115 - 100)/15 = 15/15 = 1
b) P ( 100 < X < 115) = P((100 - 100)/15 c) Draw a picture and use 68%-95%-99.5% rule to find about 34% of the students who score 115.

RELATED QUESTIONS
Please help I have been struggling with this problem for the last hour I am so confused... (answered by stanbon)

PLEASE HELP I HAVE BEEN WORKING ON THIS PROBLEM FOR THE LAST HOUR AND I HAVE STATS ONLINE (answered by stanbon)

Hello, I have this equation that I am stuck on. Please help! I am so lost!Thank you so... (answered by josmiceli)

Hi, my name is michelle. im working on a midterm review that i have tomorrow at 12. im... (answered by ad_alta)

solve using the principle of zero products (8t+3)(5t-15)=0 I don't understand it.... (answered by user_dude2008)

I am really confused on this problem: log subscript3 U+ 5Log subscript3 V Thank you (answered by Alan3354)

y={{{(2x)/(x^2-3x)}}} Hi! For this problem, what would the domain be? I am so... (answered by eggsarecool)

Hello, I am a student who is in Grade 11 and in Mathematics Grade 11 Foundations. We... (answered by mouk)

I am stumped! I have been at this math problem for what seems like hours. I would really... (answered by gonzo,Mathtut)