Posted by Mai on Monday, March 28, 2011 at 8:19pm.
The mean weight of 75 2nd graders is 55.7 lbs and
the mean weight of 25 1st graders is 42.6 lb.
What is the mean weight of the 100 children

Math  Lena, Tuesday, March 29, 2011 at 12:48am
First you must ask yourself what is mean weight? It is the average weight. So let's take the 2nd graders for example. To find the mean weight, they took the weight of 75 2nd graders, added it all together and divided by 75. To find the total weight of the 2nd graders, you would multiple the average weight by 75. Do you understand? You're simply to the opposite to get back to where you started.
2nd Graders Total Weight: 55.7 x 75 = 4177.5 lbs
1st Graders Total Weight: 42.6 x 25 = 1065
Now what you can do is add the total weights of both grades and divide by 100 to get the mean weight of the 100 children! :)
Answer This Question
Related Questions
 math  Please Help!! The mean weight of 75 2nd graders is 55.7 lbs and the mean ...
 Math  The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 ...
 math  The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 ...
 Math  The mean weight of 75 2nd graders is 55.7 lbs and the mean weight of 25 ...
 Math  Please help! How do I find the mean weight of 2 groups of 100 kids... 1st...
 statistics  Assume the body weight of healthy fifth graders is normally ...
 Algebra  If a researcher wanted to know the mean weight (the mean is the sum of...
 Math Help Please !  The sum of the weights of 8 children is 520 pounds. No two ...
 math  The average weight of 6 eight graders is 150 pounds and the average ...
 statistics  Case Study Chapter 6 and 7 FOR FULL CREDIT SHOW EQUATIONS USED AND ...
More Related Questions