The answer is 843... if you are talking about adding...
        
                    
             
        
        
        
The average speed, in km/minute, of the train is 2.79 km/minute
<h3>Calculating average speed </h3>
From the question, we are to calculate the average speed in km/minute 
From the given information, 
Distance travelled = 503 km 
Time taken = 3 hours = 3 × 60 minutes = 180 minutes
Using the average speed formula, 
Average speed = Distance / Time 
∴ Average speed of the train = 503 / 180 
Average speed of the train = 2.79 km/minute
Hence, the average speed, in km/minute, of the train is 2.79 km/minute
Learn more on Calculating average speed here: brainly.com/question/12025128 
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69% is the same as .69, which is the same as 69/100
        
                    
             
        
        
        
Answer:
Standard deviation of given data = 3.16227
Step-by-step explanation:
<u><em>Step(i)</em></u>:-
Given sample size 'n' = 5
Given data  4, 6,8,10,12

Mean of the sample x⁻ = 8
Standard deviation of the sample 
                   
<u><em>Step(ii)</em></u>:-
Given data
 
x          :         4      6       8       10      12
x-x⁻      :      4 - 8   6-8   8-8    10-8    12-8
(x-x⁻)   :        -4      -2     0          2        4
(x-x⁻)²  :        16     4       0         4        16  
  
    
 
   
  S.D = √10 = 3.16227
<u><em> Final answer</em></u>:-
 The standard deviation = 3.16227
 
        
             
        
        
        
Answer:
4m^(4)−3m^(3)−6m^(2)+5m       
Step-by-step explanation: