document.write( "Question 1134979: Assume that when adults with smartphones are randomly selected, 42% use them
\n" ); document.write( "in meetings or classes. If 8 adult smartphone users are randomly selected,
\n" ); document.write( "find the probability that at least 5 of them use their smartphones in
\n" ); document.write( "meetings or classes. \n" ); document.write( "

Algebra.Com's Answer #752504 by AnlytcPhil(1806) $\"\"$ $\"About$

You can put this solution on YOUR website!
Assume that when adults with smartphones are randomly selected, 42% use them
\n" ); document.write( "in meetings or classes. If 8 adult smartphone users are randomly selected,
\n" ); document.write( "find the probability that at least 5 of them use their smartphones in
\n" ); document.write( "meetings or classes.

\r\n" );
document.write( "Got a TI-83 or 84?\r\n" );
document.write( "\r\n" );
document.write( "On those calculators binomcdf( calculates for n trials, the probability that\r\n" );
document.write( "there will be a certain number or fewer successes.  Since this is a \"5 or\r\n" );
document.write( "more\" problem, we have to find the probability of the complement event \"4 or\r\n" );
document.write( "fewer\", and subtract it from 1.\r\n" );
document.write( "\r\n" );
document.write( "The complement event of \r\n" );
document.write( "\"at least 5 of the 8 use their smartphones in meetings or classes\" \r\n" );
document.write( "is \r\n" );
document.write( "\"4 or fewer of the 8 use their smartphones in meetings or classes.\"\r\n" );
document.write( "\r\n" );
document.write( "So type in \"1-\" on the main screen so that what we get will be subtracted from 1.\r\n" );
document.write( "\r\n" );
document.write( "You'll find binomcdf( by pressing 2ND then VARS and scrolling down to it.\r\n" );
document.write( "\r\n" );
document.write( "That's 8 trials, p: is 0.42, and the x-value is 4,  you should make sure\r\n" );
document.write( "that you see this on your screen:\r\n" );
document.write( "\r\n" );
document.write( "1-binomcdf(8,0.42,4)\r\n" );
document.write( "\r\n" );
document.write( "then press ENTER.\r\n" );
document.write( "\r\n" );
document.write( "Answer: 0.206164373\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( " \n" ); document.write( "

\n" );