Tuesday

October 21, 2014

October 21, 2014

Posted by **Adam** on Saturday, February 26, 2011 at 11:33pm.

of 70% and a standard deviation of 9%.

(A) If a student must obtain a mark of 50% to pass the exam, what proportion of students fail the exam?

(B) What is the probability that a randomly selected student will score between 65% and 85%?

(C) What is the minimum score required for a student to be in the top 10 percent of the class?

(D) What is the probability that a student will get exactly 70%?

- statistics and probability -
**drwls**, Sunday, February 27, 2011 at 12:44amFamiliarize yourself with a normal distribution table or online calculator, such as the one at

http://stattrek.com/Tables/Normal.aspx

(A) 1.3%

(B) Subtract P(x<65) from P(x<85)

(C) Find the value of X for which P(x<X) = 0.90 I get 81.5%

(D) Take the difference between getting a score of 70.5% and 69.5%

**Answer this Question**

**Related Questions**

math - Statistics: Analyze student exam scores Students were given an exam with ...

AP Statistics - Sampling Distribution Help - The composite scores of students on...

AP Statistics - sampling distribution help - The composite scores of students on...

Statistics - The next three questions refer to the following situation. Data ...

Statistics - Students were given an exam with 300 multiple-choice questions. The...

AP - The composite scores of students on the ACT college entrance examination in...

math - Students were given an exam with 300 multiple-choice questions. The ...

statistics - Scores on a national exam assume a normal distribution with a ...

statistics - Answer the question(s) based on the following situation: 150 ...

statistics - The scores of students on the ACT college entrance examination in ...