Question 1183597
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Straightforward binomial probability....<br>
The probability that each person uses his phone in meetings or classes is 0.44, so the probability that he does not is 1-0.44 = 0.56.<br>
The probability that in any particular group of 5 people 2 of them use their phones in meetings or classes (and 3 do not) is then {{{(0.44^2)*(0.56^3)}}}<br>
Finally, the number of ways of choosing 2 of the 5 people to be the ones that use their phones in meetings or classes is C(5,2).<br>
So the probability that 2 out of 5 chosen people use their phones in meetings or classes is<br>
{{{C(5,2)*(0.44^2)*(0.56^3)}}}<br>
Use a calculator....<br>