Answer:
0.84
Step-by-step explanation:
Use a calculator.  That would be 0.84.
                                3*21
Note that 63/75 = ---------- = 21/25.  Multiplying top and bottom by 4 results 
                                 3/25                   in 0.84 (so this answer checks out ok)
 
        
             
        
        
        
The expected number of heads seen in 12 flips is 8 heads seen
        
             
        
        
        
Answer:
3
Step-by-step explanation:
=12/4
the common ratio =3