Draw a normal curve with  b= 20 and a = 3.(b) Shade the region that represents p(22 ≤ x ≤ 27) and find the probability. Note that x represents a normalrandom variable with distribution described in part (a) and that p represents the probability for x to take arange of values.

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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.