Question

xi
100
200
300
400
500
600
700
800
900
1000
Total
ni
2
1
1
3
2
2
3
5
0
1
20
calculate the arithmetic mean

Answer 1

Answer:

multiply each xi with its ni and add xini

sum of xini will be 11,200

and Arithmatuc mean will be sum of xini divided by sum of ni

i.e 11,200/20 = 560