2. Calculate arithmetic mean of the following frequency distribution:
Class
less than 10
10-20
20-30
30-40
40-50
50-60
more than 60
Frequency
5
12
18
22
6
4
3
Answers
Answered by
2
Step-by-step explanation:
10-20. 5 4.5 * 22.5
20-30. 12 6 * 72
30-40. 18 9 * 162
40-50. 22 11 * 242
50-60. 6 3 * 18
60-70. 4 2 * 8
70-80 3 2.5 * 7
5+12+18+22+6+4+3 =70
22.5+72+162+ 242+18+8+7=539.5
mean =539.5÷70=7.70714
Similar questions