Question

Answer the following questions in detail−

Calculate the arithmetic mean from the following data using direct method

No. of Product sold	0-10	10-20	20-30	30-40	40-50	50-60
No. of sellers	3	17	21	19	23	7

Answer 1

No. of Products C.I.	Midpoint xi	No. of Sellers fi	xi fi
0–10	5	3	15
10–20	15	17	255
20–30	25	21	525
30–40	35	19	665
40–50	45	23	1035
50–60	55	7	385
		90	2880

$\overline{\mathrm{X}}=\frac{\sum x_i{f}_i}{\sum f_i}=\frac{2880}{90}=320$