Correct Answer - Option 3 : 42.56
Concept used:
Mean and frequency.
Calculation:
Mean of the given data
⇒ (35 + 38)/2 = 36.5
⇒ (38 + 41)/2 = 39.5
⇒ (41 + 44)/2 = 42.5
⇒ (44 + 47)/2 = 45.5
⇒ (47 + 50)/2 = 48.5
Average weight of all class
\(\Rightarrow \frac{{36.5 \times 3 + 39.5 \times 13 + 42.5 \times 13 + 45.5 \times 10 + 48.5 \times 5}}{{44}}\)
⇒ 1873/44
∴ 42.56 is the average of the class.