Question

Question was provided via image upload.

Explanation:

Calculate the total number of chocolate bars eaten

$$ \sum (x \cdot f) = (3 \cdot 6) + (4 \cdot 16) + (5 \cdot 18) = 18 + 64 + 90 = 172 $$

Calculate the total frequency

$$ \sum f = 6 + 16 + 18 = 40 $$

Calculate the mean

$$ \text{Mean} = \frac{\sum (x \cdot f)}{\sum f} = \frac{172}{40} = 4.3 $$

Answer:

\(4.3\)