trig

posted by .

in an algebra class of 21 students the mean grade on a test was 87; in another class with 32 students the mean grade was 81. What is the combined mean of the two classed?
my teacher said it's 21 * 87 + 32 * 81/53= 83.4
but i'm not sure where the 53 came from..
thanks in advance

  • trig -

    your adding the total number students from each class. 21 + 32 = 53

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Stats

    a teacher teaches two sections (A and B) of a class. Both sections have a mean score of 75. Section A only has 5 students and they all received a score of 75, while section B has 15 students with a mean score of 75 with a variance …
  2. trig.

    in an algebra class of 21 students the mean grade on a test was 87; in another class with 32 students the mean grade was 81. What is the combined mean of the two classed?
  3. algebra 2

    The average (arithmetic mean) of the test scores of class of a class of x students is 74, and the average of the test scores of a class of y students is 88. When the scores of both classes are combined, the average is 76. What is value …
  4. statistics

    below is the test scores for students in a statistics class.80,65,79,83,60,79,90,77,84,93.the professor assigned a grade of c to students whose test scores were within 5 points of the mean in either direction .how many students got …
  5. Algebra

    Ms Newton's class took the same test as Mr. Euclid's students. Ms. Newton's class has 20 students, and the average(mean) test score was 90. The average of Mr. Euclids class was 80. If you combine both classes the average score on the …
  6. Algebra

    Ms Newton's class took the same test as Mr. Euclid's students. Ms. Newton's class has 20 students, and the average(mean) test score was 90. The average of Mr. Euclids class was 80. If you combine both classes the average score on the …
  7. Math for the middle school and elementary teacher

    A prof. teaches 2 calc. classes. The first class has 25 students and their mean on the 1st test was an 82. The 2nd class has 15 students and their mean on the same test was a 74. What is the mean on this test if the prof. combines …
  8. Algebra 1

    A teacher graded the tests for each of her students. She calculated a mean grade of 80 and a standard deviation of 3. One of her students, Katrina, had a z-score of 2. What grade did Katrina get on the test?
  9. Math

    Scores from the same benchmark test are collected from two algebra classes, each with 30 students enrolled. One class had a mean score of 79 with a mean absolute deviation of 5, and on the other hand a mean score of 81 with the mean …
  10. Algebra

    Ms. Take’s and Ms. Fortune’s classes took the same test. The mean score of the 20 students in Ms. Take’s class was 75. The mean score of the 30 students in Ms. Fortune’s class was 95. Find the mean score for all students.

More Similar Questions