The weekly wages (in Rs) of 45 workers in a factory are given below:
Wages (Rs) | Number of workers
20–40 | 2
40–60 | 6
60–80 | 17
80–100 | 12
100–120 | 8
(a) Find the mean weekly wage of the workers.
(b) If another student chose Rs 60 instead of Rs 80 as the assumed mean while working out the same question, would the final value of the mean change? Give a reason for your answer.