Binomial Probability Distribution

[cnavajas]

Assume that when adults with smartphones are randomly selected, 41% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that at least 5 of them use their smartphones in meetings or classes.

 

[Steven G]

Hi. Can you please state where you are stuck? Maybe show us your work so we can see where you are stuck? Did you read the guideline for this forum? You really should. If you had and obeyed them you would have received help by now.
Can you please state the binomial theorem so we have a place to start at?

 

[pka]

Assume that when adults with smartphones are randomly selected, 41% use them in meetings or classes. If 9 adult smartphone users are randomly selected, find the probability that at least 5 of them use their smartphones in meetings or classes.

If nine are selected, the probability that five use their smartphones in meetings or classes is $\dbinom{9}{5}(0.41)^5(0.59)^4$.
What does the sum for at least five look like?