Saturday

July 26, 2014

July 26, 2014

Posted by **Sharon** on Monday, July 25, 2011 at 7:12am.

- statistics -
**PsyDAG**, Monday, July 25, 2011 at 11:48am69 = Σx/30

70 = Σx/31

Solve each for Σx, then subtract one from the other.

**Related Questions**

Maths - The teacher collected the test papers of 20 students and found that ...

statistics - the average marks for statistics in a class of 30 were 52. the top ...

statistics - there are 80 students in a math class.20% of the students in the ...

Math - Mr.Fox's fourth grade class of 20 students had an average of 72% on ...

maths - these marks were obtained by class of 28 students in a science test. the...

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. ...

programming in c++ - a program in c++ that accepts exam marks for 10 students ...

Algebra - The average mark on a test in an algebra class is 80. If the two ...

physics - A tank filled with water has marks every 10 cm on one wall. The ...