#### Answer

(a) 11.31
(b) Average of all class is more accurate and precise as compare to the average of individual groups.

#### Work Step by Step

Compute average of whole class
Compare with averages of individual groups

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Published by
University Science Books

ISBN 10:
1891389602

ISBN 13:
978-1-89138-960-3

Compute average of whole class
Compare with averages of individual groups

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