Answer:
2 2/3
Step-by-step explanation:
 
        
             
        
        
        
Answer: 0.0228
Step-by-step explanation:
Given : The  mean and the standard deviation of finish times (in minutes) for this event are respectively as :-

If the distribution of finish times is approximately bell-shaped and symmetric, then it must be normally distributed.
Let X be the random variable that represents the finish times for this event.
z score : 

Now, the probability of runners who finish in under 19 minutes by using standard normal distribution table :-

Hence, the approximate proportion of runners who finish in under 19 minutes = 0.0228
 
        
             
        
        
        
Answer:
0.41961
Step-by-step explanation:
Line the numbers up, multiply, move the decimal five times to the left.
 
        
             
        
        
        
Answer:
2
Step-by-step explanation:
378296/8=47287