3. Exam scores on a certain test are distributed normally, with a mean of 72 and...
Student scores on Professor Combs' Stats final exam are normally distributed with a mean of 72 and a standard deviation of 7.2 Find the probability of the following: (use 4 decimal places) a) The probability that one student chosen at random scores above an 77 b) The probability that 10 students chosen at random have a mean score above an 77 c) The probability that one student chosen at random scores between a 67 and an 77 d) The probability...
Juan took a Statistics exam and earned a 90%. If the exam scores are normally distributed with a mean = 75% and SD = 10%, what is Juan's z score? Based on his z score, what percentage of students scored below Juan? What is the probability of randomly selecting a student who scored below Juan?
The final exam scores in a statistics class were normally distributed with a mean of 70 and a standard deviation of 2. If you select a student at random, what is the probability that he scored between a 66 and a 74? A.2.5% B.50% C. 68% C. 95% D. none of the above
Suppose the scores on a statistic exam are normally distributed with a mean of 77 and a variance of 25. What is the 25th percentile of the scores? What is the percentile of someone who got a score of 62? What proportion of the scores are between 80 and 90? Suppose you select 35 tests at random, what is the proportion of scores above 85?
8. Suppose the scores of students on an exam are normally distributed with mean u = 17.6 and standard deviation o = 4.9. (a) Determine the distribution of the sample mean score for a randomly selected sample of 36 students who took the exam. (b) Find the probability that the sample mean score will be less than 20 for a sample of 36 randomly selected students. (c) How large a sample size would be required to ensure that the probability...
Scores on a recent national statistics exam were normally distributed with a mean of 72 and a standard deviation of 10 . What is the probability that a randomly selected exam will have a score between 75 and 80 ?
The final exam scores in a business class were normally distributed with a mean of 80.5% and a standard deviation of 4. Find the probability that a randomly selected student scored less than 73.9%.
Not ACT and SAT scores are both known to be normally distributed. In 2010, the mean and standard deviation for the ACT were ye21 and o-7, respectively. The mean and standard devlation for the SAT were #1510 and ơ-310, respectively a. what ACT score would place a student in the same percentile as a student who scored 1970 on the SAT in 20107 (In other words, what ACT score is 'equivalent to an SAT score of 19707) Round your answer...
In a recent year, the total scores for a certain standardized test were normally distributed, with a mean of 500 and a standard deviation of 10.5.(a) Find the probability that a randomly selected medical student who took the test had a total score that was less than 490 (b) Find the probability that a randomly selected medical student who took the test had a total score that was between 497 and 511(c) Find the probability that a randomly selected medical student...
The final exam scores in a statistics class were normally distributed with a mean of 70 and a standard deviation of five. What is the probability that a student scored more than 75% on the exam? a) 0.95 b)0.68 c) 0.16 d)0.84