Algebra II

The grades on the last math exam had a mean of 88%. Assume the population of grades on math exams is known to be normally distributed with a standard deviation of 6. What percent of students earn a score between 72% and 90%? (5 points)





  1. 👍 0
  2. 👎 0
  3. 👁 146
  1. Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.

    1. 👍 0
    2. 👎 0
    posted by PsyDAG
  2. jjk

    1. 👍 0
    2. 👎 0
    posted by m

Respond to this Question

First Name

Your Response

Similar Questions

  1. C++programming

    Write an interactive C program that will accept each student’s name an exam grades as input, determine an average grade for each student, and then display the student’s name, the individual exam grades and the calculated

    asked by Dscale on October 24, 2015
  2. statistics

    Last week Tom had exams in Math and in Spanish. He had a score of 45 on the Math exam and a score of 65 on the Spanish exam. For which class should Tom expect the better grade? a. Math b. Spanish c. The grades should be the same

    asked by Lyndyc on December 31, 2013
  3. O98 algebra

    To receive a C grade, a student must average more than a 77 but less than 85. If Emma received a C in the course and had five grades of 74,83,73,67,and 85 before taking the final exam, what were the possible grades for her final

    asked by Sheba on June 10, 2016
  4. algebra

    Need help in solving this To receive an A grade, a student must average 100 or less but more than 93. If Zane received an A in the course and had five grades of 95, 92, 98, 76, and 100 before taking the final exam, what were the

    asked by jennifer on October 6, 2016
  5. statistics

    Scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation of 10 points. A sample of 36 exam scores was selected from UCA with a mean score of 58 points. Using a

    asked by Anonymous on April 18, 2014
  6. Statistics

    1. The mean and standard deviation of the grades of a group of students who took an economic exam  were 69 and 7, respectively. The grades have a mound-shaped distribution. According to the Empirical Rule,    a) Approximately

    asked by Larry English on September 9, 2011
  7. algebra (i need help calculating my grade)

    i have exams tomorrow and i would like to figure out what i need to make on my exam to pass, daily grades are 30% major grades are 70% i averaged my daily grades to 84.5 my major grades so far are 77,85,91 what do i do next to

    asked by Belle on October 22, 2009
  8. Statistics

    Exam Grades. A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed

    asked by Gabriela on April 17, 2013
  9. Statistics

    The grades in the final exam of a random sample of 25 students produce a standard deviation, s = 9.5. a) Construct a 90% confidence interval estimate for the population variance, . b) Can we infer at 10% level of significance that

    asked by Kendra on November 25, 2014
  10. Math

    The list shows the final exam grades for Ms. Gold's math class. Make a stem - and - leaf plot for the data. 66, 98, 92, 91, 69, 55, 53, 90, 67, 74, 57, 58, 60, 59, 86, 92, 63, 55, 51, 84 A) 5|1 3 5 5 7 8 6|0 3 6 7 9 9 7|4 8|4 6

    asked by nebula🌌 on April 12, 2019

More Similar Questions