document.write( "Question 1177792: A man fires at a target six times; the probability of his hitting it each time is independent of other tries and is 0.40.
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\n" ); document.write( "(b) How many times must he fire at the target so that the probability of hitting it at least once is greater than 0.77 ?
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Algebra.Com's Answer #806890 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi\r\n" );
document.write( "Binomial Distribution:  p (will hit target) = .40  \r\n" );
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document.write( "(a) n = 6:  P(at least once) = 1 - P(x = 0) = 1 - .0467 = .9533\r\n" );
document.write( "  1 0r 2 0r 3 0r 4 0r 5 0r 6\r\n" );
document.write( ".1866 + .31104 + .2765 + .1382 + .0369 + .0041 = .9533\r\n" );
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document.write( "(b) n = 3   P(at least once) = 1 - P(x ≤ 0) = 1 - .22 = .78\r\n" );
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document.write( "Wish You the Best in your Studies.\r\n" );
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