document.write( "Question 1175347: According to one poll, 45% of households in a certain region still had landline phone service. Suppose a random sample of 50 households from the region is taken. Complete parts (a) through (d) below. a. Find the probability that exactly 20 of the households sampled still have a landline. \n" ); document.write( "

Algebra.Com's Answer #800941 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( " p-hat = 20/50 = .40\r\n" );
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document.write( "   z =  = -.7107\r\n" );
document.write( " P(z ≤ -.7107)= .2386\r\n" );
document.write( "Wish You the Best in your Studies.\r\n" );
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