Question says find the average difference in weight between two groups in grams but first we should know that unit of weight cannot be the gram because it is the unit of force while gram is the unit of mass of a body.
Here due to confusion between, I am going to explain basic difference between mass and weight. Also, I find both average difference in weight as well as mass.
Answer:
Average difference in Weight=41.65units
Average difference in Mass=4.25g
Step-by-step explanation:
Mass:
- Quantity of matter contained in a body is called mass.
- it's unit is kilogram/gram
Weight:
- Force exerted on a body due to gravity.
- it's unit newton/lbf (pound force)
Given:
The average mass of a rate in control group is =m1= 60.4g
The average mass of a rat in experimental group is =m2= 0.0689kg
Required:
A) Average difference in mass=?
B) Average difference in weight=?
Solution:
To find the difference first we need to make the units same as grams.
m1=60.4g
m2=0.0689kg=0.0689*1000=68.9g (1kg=1000g)
A) Average difference in mass=?
Average difference in mass= the difference in average masses of two groups.
Average difference in mass= 
=
B) Average difference in weight=?
As we know
weight=w=mg (g=gravitational force=9.8)
w1=m1g=60.4*9.8=591.92
w2=m2g=68.9*9.8=675.22
Thus, Average difference in weight of two groups=
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