Statisitcs

posted by Chandler

If the student ratings of the overall effectiveness of professors is normally distributed with a mean of 5 and a standard deviation of 1.75, what proportion of the professors will be expected to be rated below 2.55?

  1. MsPi_3.14159265

    This is a z-score
    z=(x-mu)/(standard deviation)
    z=(2.55-5)/(1.75)
    find z then look it up on your "areas under the curve normal distribution table" in the back of your textbook : )

Respond to this Question

First Name

Your Answer

Similar Questions

  1. statistics

    The scores on a personality test are normally distributed with a mean of 250 and a standard deviation of 30. What proportion of people taking the test can be expected to score above 229?
  2. Statistics

    The grades for Economics students at a large university are found to be normally distributed with a mean of 76 and a standard deviation of 4. What proportion of the students are expected to have a grade between 84 and 88?
  3. ELEMENTARY STATISTICS

    50 MATH PROFESSORS WERE ASKED HOW LONG IT TAKES TO GRADE A STUDENT'S HOMEWORK ASSIGNMENT. THE MEAN GRADING TIME FOR THE SAMPLE WAS 36.2 MINUTES WITH A STANDARD DEVIATION OF 4.8 MINUTES. WHAT IS THE 99% CONFIDENCE INTERVAL FOR THE MEAN …
  4. statistics

    if the average number of textbooks in professors' offices is 16, the standard deviation is 5, and the average age of the professors is 43,with a standard deviation of 8 ,which data set is more variable ?
  5. statistics

    If the average number of textbooks in professors offices is 16 with a standard deviation of 5; and the average age of professors is 43 with a standard deviation of 8. Calculate the covariance of the number of textbooks in professors …
  6. Statisitcs

    The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and …
  7. statistic

    3 statistics professors and 7 chemistry professors are available to be advisors.If each professor has an equal chance of being selected, what is the probability that both professors are cgemistry professors?
  8. 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 …
  9. Statistics

    The amount of time the university professors devote to their jobs per week is normally dis- tributed with a mean of 52 hours and a standard deviation of 8 hours. (a) What is the probability that a professor works for more than 56 hours …
  10. English

    1. Do the shorter straws in the musical pipe make a higher sound than the longer ones?

More Similar Questions