From the five-number summary 7, 13, 17, 21, and 43 determined after the students took the exam, which statement below is true? O The mean of the lowest 25% is 7. O Twenty-five percent of students earned 17 points or less. O Seventy-five percent of students earned 17 points or more.

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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.