Answer
10,000 different codes are possible.
Work Step by Step
For each digit there are 10 possibilities (repetition of digits is allowed).
Using the Multiplication Rule of Counting (see page 298):
$10\times10\times10\times10=10,000$
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 5 - Section 5.5 - Assess Your Understanding - Applying the Concepts - Page 306: 39a
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