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.
543 432 389 499 498 493
335 488 418 420 529 480
483 513 481 545 526 547
A) Determine the standard deviation and interquartile range of the data.
B) Suppose the month in which the customer used 327 minutes was not actually that customers phone That particular month the customer did not use their phone at all so 0 minutes were used. How does changing the observation from 327 to 0 affect the standard deviation and interquartile range?
The standard deviationand the interquartile range.
What property does this illustrate?
A. Empirical Rule.
B. Resistance.
C. Weighted Mean.
D. Dispersion.

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?

Aprisoner is trapped in a cell containing three doors. the first door leads to a tunnel that returns him to his cell after two days of travel. the second leads to a tunnel that returns him to his cell after three days of travel. the third door leads immediately to freedom. (a) assuming that the prisoner will always select doors 1, 2 and 3 with probabili- ties 0.5,0.3,0.2 (respectively), what is the expected number of days until he reaches freedom? (b) assuming that the prisoner is always equally likely to choose among those doors that he has not used, what is the expected number of days until he reaches freedom? (in this version, if the prisoner initially tries door 1, for example, then when he returns to the cell, he will now select only from doors 2 and 3.) (c) for parts (a) and (b), find the variance of the number of days until the prisoner reaches freedom. hint for part (b): define ni to be the number of additional days the prisoner spends after initially choosing door i and returning to his cell.

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.