statistics
posted by chai .
The IQ of 100 college students in XYZ univ are found to be normally distributed where mean is 105 and standard deviation is 8. If the student IQ score is 90, what is the probability that another student randomly slected has an IQ score of below 90.

Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the probability related to that Z score. 
3100
Matthews, Young and Associates, a Chapel Hill consulting firm, has these records indicating the number of days each of its ten staff consultants billed last year:
212 320 230 210 229 231 219 221 222
a)Without computing the value of any of these measures, which of them would you guess would give you more information about this distribution: range or standard deviation?
b) Considering the difficulty and time of computing each of the measures you reviewed in part (c), which one would you suggest is better?
(d) What will cause you to change your mind about your choice?
Respond to this Question
Similar Questions

statistics
SAT scores are normally distributed. The SAT in English has a mean score of 500 and a standard deviation of 100. a. Find the probability that a randomly selected student's score on the English part of the SAT is between 400 and 675. … 
statistics and probability
It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean 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 … 
statistics
Suppose that SAT scores among U.S. college students are normally distributed with a mean of 450 and a standard deviation of 150. What is the probability that a randomly selected individual from this population has an SAT score at or … 
statistics
Reading placement scores for a particular college are normally distributed with a mean of 72 and a standard deviation of 7. a) draw a sketch of the reading placement scores for students at this college. be sure to mark the mean and … 
statistics
Suppose that the test scores for a college entrance exam are normally distributed with a mean of 450 and a standard deviation of 100. If a student is selected at random what is the probability that the student will score above 600? 
statistics
Can you please tell me how to solve for the following? 
statisitcs
The combined math and verbal scores for students taking a national standardized examination for college admission is normally distributed with a mean of 560 and a standard deviation of 180. If a college requires a student to be in … 
College of education ekiadolor Benin
The scores of an achievement test given to 100,000 students are normally distributed with mean 500 and standard deviation 100.what should the score of a student be to place him or her among the 10% of the students? 
probability
The National Center for Educational Statistics reported that in 2009 the ACT college placement and admission examination were normally distributed and had a mean of 21.1 and standard deviation of 5.1. A college requires applicants … 
statistics and probability
n a written test given to a large class comprising 42 students, the test scores were found to be normally distributed with a mean of 78 and a standard deviation of 7. A minimum score of 60 was needed to pass the test. A score of 90 …