Answer:
The Key difference between average vs weighted average is that simple average is nothing but simply adding up all the observation values and dividing the same by the total number of observations to calculate the average whereas weighted average is an average where each observation value will have a frequency assigned.
Explanation:
 
        
             
        
        
        
Answer:
D
Explanation:
Organic compounds are chemical compounds which usually contains one or more atoms of carbon, hydrogen, oxygen and sometimes nitrogen or sulphur. Carbon and hydrogen are the main element that is contained in most organic compounds.
Option A is wrong because calcium phosphate is not an organic compound, although all the other compounds in the option are organic compounds.
Option B is wrong because calcium chloride is not an organic compound 
Option C is wrong also as calcium sulphate is not an organic compound 
Option D is correct as all are organic compounds 
 
        
             
        
        
        
Answer:
the answer is "I HOPE IT HELPS"
 
        
             
        
        
        
First shell from the nucleus can have a maximum of 2 electrons ! hope this helped