Question

Help me please !

Answer 1

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 2

@nikato

Answer 3

Ok. I hope you'll understand what I'm gonna say so...

You know the mean is 12.89 and the standard deviation is 1.95
So if you add and subtract 1.95 with 12.89, you get 10.94 and 14.84
And these two numbers represent the "normal"/ average range.
So scoring between 10.94-14.84 would be average
Since Marcus scored 13.7, it is still part of the average range which means he didn't score in the top 2% which is why he didn't receive a certificate

Answer 4

Thank you for being kind enough to write this but no i did not understand any of that. Math is not my forte, I am taking remedial math at college, thank god I am not a math major.

Answer 5

Ok. So what part don't you understand?

Answer 6

Every single word is foreign to me, I will not understand

Answer 7

Ok. So lets break it up.
The mean is 12.89, agree?

Answer 8

What is a mean

Answer 9

It's the average.
To find the mean, you add up all the numbers and divide that by the # of numbers there are

For example, you have a data of 2,5,8,1,12
To find the average, you would add up all the numbers which = 28
And there are 5 numbers.
So the average is
28/5 = 5.6

Answer 10

ok... ill just go along

Answer 11

Ok. So just remember for mean.
Add up all numbers and divide the sum by the # of numbers there are

Standard deviation is how far away the "normal" range is from the mean
http://www.mathsisfun.com/data/standard-deviation.html