To find the point estimate (sample mean), sum all the amounts spent and divide by the number of customers.
Given amounts:
\[ 48.16, 42.22, 46.82, 51.45, 23.78, 41.86, 54.86, 37.92, 52.64, 48.59, 50.82, 46.94, 61.83, 61.69, 49.17, 61.46, 51.35, 52.68, 58.84,
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