To find the mean, we need to multiply each data value by its frequency, sum the products, and then divide by the total frequency.
Mean = $\frac{(14 \times 14) + (15 \times 11) + (16 \times 23) + (17 \times 10) + (18 \times 13)}{14 + 11 + 23 + 10 + 13}$
Mean =
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