15)  For Decimal answer write to two decimal places. For example 25.50, 25.25. Don't write 25.5 (write 25.50).  X Cumulative Percentage 7 100 6 92 5 80 4 56 3 20 2 4   . What is the percentile rank for X = 2.5? . What is the percentile rank for X = 6.5? . What is the 20th percentile? . What is the 80th percentile?

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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.