Saturday

August 30, 2014

August 30, 2014

Posted by **Anonymous** on Tuesday, March 20, 2012 at 8:07pm.

- statistics -
**MathMate**, Tuesday, March 20, 2012 at 8:16pmμ=50, σ=10;

For score 70, convert to standardized value

z=(x-μ)/σ=(70-50)/10=2

P(x>70)=P(z>2)

Look up standard normal distribution table to get

P(z<=2)=0.9772, so

P(x>70)=P(z>2)=1-0.9772=0.0228

or the average number of students with score of 70 or more

= P(x>70)*200=4.56 = 5 approx.

**Related Questions**

statistics - Ram earned a score of 940 on a national achievement test. The mean ...

Statistics - Suppose you administered an anxiety test to a large sample of ...

statistics - Suppose you administered an anxiety test to a large sample of ...

statistics - In a psychology class of 100 students, test scores are normally ...

statistics - Suppose that the population standard deviation (ó) for a normally ...

Word Problem - A math teacher gives two different tests to measure students' ...

statistics - The scores for standardized test are normally distributed with a ...

statistics - The Survey of Study Habits and Attitudes (SSHA) is a psychological ...

Statistics - 5. Scores on a recent national statistics exam were normally ...

Analytical Skills - If your score on a statistics exam was 76 and the professor ...