document.write( "Question 1167384: Assume that when adult with smartphone are randomly selected, 41% use them in meeting or clases . If 7 adult smartphone users are randomly selected, find the probability that at least 2 of them use their smartphone in meeting or classes \n" ); document.write( "

Algebra.Com's Answer #792021 by VFBundy(438) $\"\"$ $\"About$

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Instead of computing the probability that \"at least two\" smartphone users use their smartphones in class, compute the probability that one or zero smartphone users use their smartphones in class.
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\n" ); document.write( "Probability that exactly one smartphone user uses their smartphone in class:
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\n" ); document.write( " $\"%280.41%29%5E1+%2A+%280.59%29%5E6+%2A+%287%21%2F%281%21%2A6%21%29%29\"$ = 0.41 * 0.042181 * 7 = 0.1211
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\n" ); document.write( "Probability that exactly zero smartphone users use their smartphones in class:
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\n" ); document.write( " $\"%280.59%29%5E7\"$ = 0.0249
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\n" ); document.write( "Probability that one or zero smartphone users use their smartphones in class:
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\n" ); document.write( "0.1211 + 0.0249 = 0.1460
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\n" ); document.write( "Therefore, the probability that \"at least two\" smartphone users use their smartphones in class:
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\n" ); document.write( "1 - 0.1460 = 0.8540 \n" ); document.write( "

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