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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
<u>z²-2i=0</u>
Answer:
Solution given:
z⁴=-4
doing square root on both side
we know i²=-1
substituting i² we get
z²=
z²=2i
z²-2i=0 is a required answer. where
z² and 2 is real number.