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A sample of the most popular songs on the billboards was taken. The duration in seconds...

A sample of the most popular songs on the billboards was taken. The duration in seconds are the following:

448 242 231 246 246 293 280 227 244 213 262 239 213 258 255 257

Calculate the lower limit of the confidence interval of the variance using a confidence level of 95%. use two decimals after the period.

Math   Statistics-And-Probability   
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