SOLUTION: (c) It is observed that the average scores on a science test are normally distributed with a mean of 500 and a standard deviation of 80. The scores may have fractional parts. (i)

Question 829059: (c) It is observed that the average scores on a science test are normally distributed with a mean of 500 and a standard deviation of 80. The scores may have fractional parts.
(i) What proportion of the scores is between 400 and 600? 1 mark
(ii) What value do the upper 10% of the scores exceed?

Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
1.

You can calculate or use symmetry since
Either way

2. Using EXCEL's NORM.INV function for , then

RELATED QUESTIONS
The scores of students on the logic test of an entrance examination are normally... (answered by ikleyn)

XYZ Corporation gives each of its employees an aptitude test. The scores on the test are... (answered by Boreal)

The scores for a standardized reading test are found to be normally distributed with a... (answered by Scriptor)

The scores of students on a standardized test are normally distributed with a mean of 300 (answered by stanbon)

A standardized test is designed so that the scores are normally distributed with a mean... (answered by dfrazzetto)

A math teacher gives two different tests to measure students� aptitude for math. Scores... (answered by ikleyn)

MNM Corporation gives each of its employees an aptitude test. The scores on the test are... (answered by ewatrrr)

Scores on an English test are normally distributed with a mean of 33.7 and a standard... (answered by Boreal)

The scores on a college entrance examination are normally distributed with a mean of 550... (answered by VFBundy)