A researcher studied the weight of two species of rats: brown rats, and gray rats. Samples from both species yielded the

following information: (the weight is in grams).

• Mean Standard Deviation

Brown Rats 25.2 3.5

Gray Rats 34.8 7.0

(a) What weight of a gray rat would make it comparable to a brown rat that weighs 21 grams? (hint: compare z-scores)

(b) If a brown rat weighs 32.9 grams, would you classify it as an outlying observation? (Justify your answer).

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