Question

Find the mean and mode of the following frequency distribution:
Classes Frequency
0-10 3
10-20 8
20-30 10
30-40 15
40-50 7
50-60 4
60-70 3​

Answer 1

Answer:

mean = 32.8

Mode = 33.85

Step-by-step explanation:

Class. Mid point frequency. Xi Fi

0-10. 5. 3. 15.

10-20. 15. 8. 120

20-30. 25. 10. 250

30-40. 35. 15 525

40-50. 45. 7. 315

50-60. 55. 4. 220

60-70. 65. 3. 195

Mean = Sum of XiFi / sum of Fi

= 1640/50 = 32.5

Mode = 30+ ( 15-10)/(2*15-10-7)*10 = 30+3.85= 33.85