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Mean weight of whole from sample size

I do not know how to do the following question:

"A fish wholesaler has a catch of several thousand lobsters. A prospective buyer selected 40 at random and obtained the following weights in ounces:

21.3, 21.1, 21.4, 18.8, 20.2, 19.3, 19.1, 18.3, 19.9, 22.0,
20.6, 20.7, 21.9, 20.1, 17.1, 19.3, 21.2, 18.4, 21.0, 21.6,
16.5, 18.9, 17.4, 20.8, 18.5, 18.1, 21.1, 19.3, 21.5, 20.1,
21.8, 20.2, 19.7, 18.9, 19.5, 20.0, 18.7, 21.6, 20.9, 21.5,

The prospective buyer will purchase the entire catch if it can be shown that the mean weight (of the entire catch) exceeds 19.9 ounces. Should he purchase the entire catch?"

Solution Preview

Weight, X X - X̅ (X - X̅)^2
21.3 1.3425 1.80230625
21.1 1.1425 1.30530625
21.4 1.4425 2.08080625
18.8 -1.1575 1.33980625
20.2 0.2425 0.05880625
19.3 -0.6575 0.43230625
19.1 -0.8575 0.73530625
18.3 -1.6575 2.74730625
19.9 -0.0575 0.00330625
22 2.0425 4.17180625
20.6 0.6425 0.41280625
20.7 0.7425 0.55130625
21.9 1.9425 3.77330625
20.1 0.1425 0.02030625
17.1 -2.8575 8.16530625
19.3 -0.6575 0.43230625
21.2 1.2425 1.54380625
18.4 -1.5575 2.42580625
21 1.0425 1.08680625
21.6 ...

Solution Summary

Mean weight of whole from sample size is examined.

$2.19