Answer
0.886
Work Step by Step
Given $p=1/4=0.25, n=8$ use binomial formula
P($X\leq3$)=P(0)+P(1)+P(2)+P(3)
=$_8C_00.25^00.75^8+_8C_10.25^10.75^7+_8C_20.25^20.75^6+_8C_30.25^30.75^5
=0.886$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 5 - Discrete Probability Distributions - Review Exercises - Section 5-3 - Page 305: 19
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