document.write( "Question 892502: Explain why there must be a mistake in each of the following statements.
\n" ); document.write( " a)The probability that a mineral sample will contain silver is 0.38 and the probability that will not contain silver is 0.52.
\n" ); document.write( " b)The probability that a drilling operation will be a success is 0.34 and the probability that it will not be a success is -0.66.
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Algebra.Com's Answer #540594 by Fombitz(32388) $\"\"$ $\"About$

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a) There are only two possibilities: silver or no silver. The probabilities must sum to 1. In this example, they sum to 0.90.
\n" ); document.write( "b) Again the probabilities must sum to 1 and probabilities must be greater than or equal to zero and less than or equal to 1. Negative values are excluded.
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