The annual 2-mile fun-run is a traditional fund-raising event to support local arts and sciences activities. It is known that the mean and standard deviation of finish times for this event are respectively u = 30 and o = 5.5 minutes. Suppose the distribution of finish times is approximately bell-shaped and symmetric.  A person finished this running in 25 minutes. The corresponding Z-score for this person is about: ?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.