Answer
0.52822
Work Step by Step
The probability of having 4 or 5 failures is .
$5*(.7)^4*(0.3)^1+0.7^5=0.52822$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.