Answer:
the first tree is 5ft and the second one is 6ft 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
B if it's not right 
 sorry :(
Step-by-step explanation:
 
        
             
        
        
        
Answer:
a) The mean of the probability distribution = 0.6 
b) The variance of the probability distribution = 0.3
c) The standard deviation of the probability distribution = 0.5
Step-by-step explanation:
a) Data and Calculations:
number of dogs per household in a small town
Dogs   Probability  Expected  Mean Diff    Mean Diff. 
                                Value                            Squared
0          0.650           0               -0.569         0.32376
1           0.216            0.216        -0.353          0.12461
2         0.087            0.174         -0.395          0.15603
3          0.026            0.078       -0.491            0.24108
4          0.014             0.056       -0.513           0.26317
5          0.009          0.045       -0.524           0.27458
The mean =           0.569 (Sum of expected value)                           
Variance = mean of squared differences = 0.27665 (1.38323/5)
Standard deviation = square root of variance = 0.526 = 0.5