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A cellular phone company monitors monthly phone usage. The following data represent the monthly phone use...

A cellular phone company monitors monthly phone usage. The following data represent the monthly phone use in minutes of one particular customer for the past 20 months. Use the given data to answer parts​ (a) and​ (b). 327 401 339 342 559 326 344 419 469 492 340 323 548 479 446 350 441 550 486 366

​(a) Determine the standard deviation and interquartile range of the data.

Math   Statistics-And-Probability   
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