#### Answer

About 133 calculators.

#### Work Step by Step

The probability of any given calculator being defective is:
4/450 = .00888
We multiply this by 15,000 to estimate:
.00888*15000
$\approx 133$

Published by
Prentice Hall

ISBN 10:
0133281159

ISBN 13:
978-0-13328-115-6

About 133 calculators.

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