According to a survey, 26.8% of credit-card-holding families in a certain area hardly ever pay off the balance. Suppose a random sample of 20 credit-card-holding families is taken. Find the probability that at least 4 families hardly ever pay off the balance. The probability that at least 4 families hardly ever pay off the balance is (Round to four decimal places as needed.)

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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According to a survey, 26.8% of credit-card-holding families in a certain area hardly ever pay off the balance. Suppose a
random sample of 20 credit-card-holding families is taken. Find the probability that at least 4 families hardly ever pay off
the balance.
The probability that at least 4 families hardly ever pay off the balance is
(Round to four decimal places as needed.)
Transcribed Image Text:According to a survey, 26.8% of credit-card-holding families in a certain area hardly ever pay off the balance. Suppose a random sample of 20 credit-card-holding families is taken. Find the probability that at least 4 families hardly ever pay off the balance. The probability that at least 4 families hardly ever pay off the balance is (Round to four decimal places as needed.)
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