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# Probability

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A car dealership surveys 10,000 of its customers who have a GPS system in their cars to find out how often they have used it within the past month. The results are as follows:

Number of Times Used                  Customers with GPS

0                                                        1382

1-5                                                       2350

6-10                                                    2010

11-15                                                   1863

16-20                                                  1925

21+                                                      470

a) What is the probability that a randomly chosen customer will have used the GPS system more than 20 times?

b) What is the probability that a randomly chosen customer will have used the GPS system no more than 10 times?

Guest Jun 15, 2017
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a )  P (> 20)  =  470 / 10000 =  .047  = 4.7%

b )    P ( no more than 10)  =  [ 1382 + 2350 + 2010] / 10000  = .5742  = 57.42 %

CPhill  Jun 15, 2017