Question

Algebra.
The original question.
Scores on a statewide standardized test are normally distributed with a mean of 12.89 and a standard deviation of 1.95. Certificates are given to students whose scores are in the top 2% of those who took the test. This means that they scored better than 98% of the other test takers. Marcus received his score of 13.7 on the exam and is wondering why he didn’t receive a certificate. Show all work to determine whether Marcus’ score was high enough to earn a certificate. Write a letter to Marcus explaining whether or not he will be receiving a certificate. Include a brief summary of your statistical analysis in your letter.

Answer 1

My answer http://gyazo.com/ab7f9a66b7faff048f074cb0f7884e21

Answer 2

How would I use the Z-Score I got?

Answer 3

@phi

Answer 4

Do you know how I would use my Zscore, Phi?

Answer 5

I was wondering how you got your result.
Certificates are given to students whose scores are in the top 2%
what Z-score do you need so the area under the curve from -infinity to +Z = 0.98
(or the area from the mean to +z is 0.48 ) ?

Answer 6

I'm not understanding your question.