Wednesday
April 23, 2014

Homework Help: trig.

Posted by jerson on Monday, September 8, 2008 at 8:24pm.

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

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

trig - in an algebra class of 21 students the mean grade on a test was 87; in ...
Math for the middle school and elementary teacher - A prof. teaches 2 calc. ...
Algebra - Ms Newton's class took the same test as Mr. Euclid's students. Ms. ...
Algebra - Ms Newton's class took the same test as Mr. Euclid's students. Ms. ...
math algebra - 42 students took a test in school where the passing score was 70...
Algebra - On a math test, k students in the class averaged 80%. The remaining ...
algebra 2 - The average (arithmetic mean) of the test scores of class of a class...
math - For a class of 43 students, for a certain test, the mean grade is 67 and ...
Statistics - the mean age for 12 students in a math class is 20. 2 older ...
statistics - below is the test scores for students in a statistics class.80,65,...

Search
Members