Question

Daily income of 10 families is given as follows:

S. No.	1	2	3	4	5	6	7	8	9	10
Daily Income (in ₹)	100	120	80	85	95	130	200	250	225	275

Calculate average daily income

Answer 1

Serial No.	Daily Income (in Rs) (X)
1 2 3 4 5 6 7 8 9 10	100 120 80 85 95 130 200 250 225 275
N=10	$\mathbf{\sum }_{}\mathit{X}$= 1560

Calculating the average daily income using direct method:

$$\begin{gathered} \mathrm{Average}\left(\overline{X}\right)=\frac{{\displaystyle \sum _{}}X}{N} \\ \mathrm{or},\overline{X}=\frac{100+120+80+85+95+130+200+250+225+275}{10} \\ \mathrm{or},\overline{X}=\frac{1560}{10} \\ \Rightarrow \overline{X}=\mathrm{Rs}156 \end{gathered}$$

Hence, the average daily income is Rs 156