SOLUTION: The results of the last test in Algebra 2/Trig. class were normally distributed and had an average of 75. If the variance (σ2) was 25, what percent of the students taking the

Algebra ->  Probability-and-statistics -> SOLUTION: The results of the last test in Algebra 2/Trig. class were normally distributed and had an average of 75. If the variance (σ2) was 25, what percent of the students taking the       Log On


   

Question 271891: The results of the last test in Algebra 2/Trig. class were normally distributed and had an average of 75. If the variance (σ2) was 25, what percent of the students taking the exam scored above an 80?
What are the step to solving a question like this using a TI-83 Plus graphing calculator? What exactly do you enter in the calculator?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The results of the last test in Algebra 2/Trig. class were normally distributed and had an average of 75. If the variance (σ2) was 25, what percent of the students taking the exam scored above an 80?
What are the step to solving a question like this using a TI-83 Plus graphing calculator? What exactly do you enter in the calculator?
----
If sigma^2 = 25, sigma = 5
------
2nd; DIST
normalcdf(80,100,75,5)
Enter
------
Ans: 0.1587 = 15.87%
==============================
Cheers,
Stan H.