Please Help!!

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

To find the mean weight of all 100 children, you need to calculate the total weight of all the children and then divide it by the total number of children.

Step 1: Calculate the total weight of the 2nd graders.
The mean weight of the 2nd graders is given as 55.7 lbs. Multiply this by the number of 2nd graders (75) to get the total weight of the 2nd graders.

Total weight of 2nd graders = 55.7 lbs * 75 = 4180 lbs

Step 2: Calculate the total weight of the 1st graders.
The mean weight of the 1st graders is given as 42.6 lbs. Multiply this by the number of 1st graders (25) to get the total weight of the 1st graders.

Total weight of 1st graders = 42.6 lbs * 25 = 1065 lbs

Step 3: Add the total weight of the 2nd graders and the 1st graders to get the total weight of all 100 children.

Total weight of all children = Total weight of 2nd graders + Total weight of 1st graders
= 4180 lbs + 1065 lbs
= 5245 lbs

Step 4: Calculate the mean weight of all 100 children.
Divide the total weight of all children by the total number of children (100) to find the mean weight.

Mean weight of all 100 children = Total weight of all children / Total number of children
= 5245 lbs / 100
= 52.45 lbs

Therefore, the mean weight of the 100 children is 52.45 lbs.