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November 22, 2014

November 22, 2014

Posted by **Katie** on Tuesday, September 27, 2011 at 10:04pm.

4280 tickets were sold in all, what is the probability that the grand prize winner is:

a. Mr. or Mrs. Smith? b. one of the 5 Smiths? c. none of the Smiths?

- math -
**Corey**, Tuesday, September 27, 2011 at 11:29pma) The probability for one or the other is 10/4280 (1/428). For one of the two, add each of their probabilities (1/428)+(1/428) gives an answer of 1/214.

b) The probability for any one child is 4/4280 (1/1070). Adding together the three children's probability (1/1070)+(1/1070)+(1/1070) gives an answer of 3/1070.

c)Since the total tickets for the Smiths are 32 tickets, 4280-32 (4248) tickets are possessed by others. 4248/4280 (531/535) is the probability another will win.

- math -
**michelle**, Tuesday, September 27, 2011 at 11:34pma. 10/4280

0.0023

b. (10+12) = total tickets

22/4280 = 0.051

c. (4280-22) divided by 4280

0.9949

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