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Asked Dec 29, 2019
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At Least One. Find the probability. 

Phone Survey Subjects for the next presidential election poll are contacted using telephone numbers in which the last four digits are randomly selected (with replacement). Find the probability that for one such phone number, the last four digits include at least one 0.

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Expert Answer

Step 1

The possible numbers for telephone number are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. The probability of getting 0 is 0.1(=1/10).

 

The random variable X as the number of 0’s and fo...

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