Question

Find the mean of the following grouped data using short cut method.
Classes :
0-10
10-20 20-30 30-40 40-50 50-60 60-70
1
3
7
5
3
1
5
Frequencies:​

Answer 1

Step-by-step explanation:

15we have to multiple. fir(xi) 15

25 75

35 245

45 135

55 55

65 325

total

240 850

fixi/fi

850/240=3.54