Suppose that 4% of all books in a library have red covers. In a group of n books selected from the shelves, consider the probability that at most two red books are selected. How large must n be before this probability is less than 0.02?
p = 0.04
The probability that at most two red books are selected. =
critical z value corresponding to probability 0.02 is -2.0537
solving for x we get two roots
sample size should be positive so we will consider x = 13.71
n shall be 188
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