A cellular phone company monitors monthly phone usage. The following data repres

Question

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).

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

S= ____ ?(Round to two decimal places as? needed.)

IQR= ____ ?(Type an integer or a? decimal.) ?

(b) Suppose the month in which the customer used 324 minutes was not actually that? customer's phone. That particular month the customer did not use their phone at? all, so 0 minutes were used. How does changing the observation from 324 to 0 affect the standard deviation and interquartile? range?

What property does this? illustrate? The standard deviation ? is not affected increases decreases and the interquartile range ? increases is not affected decreases .

What property does this? illustrate? Choose the correct answer below. Empirical Rule Weighted Mean Resistance Dispersion

324 419 378 496 446 550 382 390 341 363 329 507 540 463 515 450 370 347 497 400

Explanation / Answer

a)

s = 73.19

IQR = 128

b)

Replacing 0 with 324

s= 118.58

IQR = 128

c)

INCREASE

REMAINS THE SAME

RESISTANCE

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