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Cellular Phone Sales The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the mean, variance, and standard deviation for this probability distribution.

X

4

5

6

8

10

P (X)

0.4

0.3

0.1

0.15

0.05

What is the probability that they will sell 6 or more contracts three days in a row?

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