document.write( "Question 1104705: Z is a standard normal variable. Compute the requested probability when
\n" ); document.write( " P(-.87 ≤Z≤ 2.21) \n" ); document.write( "

Algebra.Com's Answer #719406 by jim_thompson5910(35256) $\"\"$ $\"About$

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\n" ); document.write( "I'm going to use this table (a similar one should be found in the back of your textbook)\r
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\n" ); document.write( "\n" ); document.write( "Using that table, we can find the following:
\n" ); document.write( "P(Z < -0.87) = 0.1922 (see this image to see how I got the value)
\n" ); document.write( "P(Z < 2.21) = 0.9864 (see this image to see how I got the value)\r
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\n" ); document.write( "\n" ); document.write( "So,
\n" ); document.write( "P(a < Z < b) = P(Z < b) - P(Z < a)
\n" ); document.write( "P(-0.87 < Z < 2.21) = P(Z < 2.21) - P(Z < -0.87)
\n" ); document.write( "P(-0.87 < Z < 2.21) = 0.9864 - 0.1922
\n" ); document.write( "P(-0.87 < Z < 2.21) = 0.7942 (which is the final answer)
\n" ); document.write( "The values are approximate
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