#### Answer

29.82

#### Work Step by Step

$s^{2}_{p} = \frac{(20-1)25 + (10-1)40}{20+10-2}$
= $\frac{475 + 360}{28} = 29.82$

Published by
Pearson

ISBN 10:
0321755936

ISBN 13:
978-0-32175-593-3

29.82

$s^{2}_{p} = \frac{(20-1)25 + (10-1)40}{20+10-2}$
= $\frac{475 + 360}{28} = 29.82$

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