Speed is distance over time. There’s no distance in the question and the time is 1 hr 30 mins hence 1.5 hours.
Answer:
12
Step-by-step explanation:
0 + 12 = 12
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:
4/9
Step-by-step explanation:
The slope of these points would be: (5-1)/(3+6) = 4/9
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