Question

Complete the activity to find mean by direct method. 

Weekly wages (Rupees)	Class mark (xi)	No. of workers (fi)	xifi
1000 – 2000	1500	25	37500
2000 – 3000	`square`	45	112500
3000 – 4000	3500	50	`square`
4000 – 5000	4500	30	`square`
		N = 150	Σfixi = `square`

Mean = `(sumf_ix_i)/(sumf_i)`

= `square/150`

= `square`

Answer 1

Weekly wages (Rupees)	Class mark (xi)	No. of workers (fi)	xifi
1000 – 2000	1500	25	37500
2000 – 3000	\[\boxed{2500}\]	45	112500
3000 – 4000	3500	50	\[\boxed{175000}\]
4000 – 5000	4500	30	\[\boxed{135000}\]
		N = 150	Σfixi = \[\boxed{460000}\]

Mean = `(sumf_ix_i)/(sumf_i)`

= \[\frac{\boxed{460000}}{150}\]

= \[\boxed{3066.67}\]