Question

The mean of the following frequency table 50..
But the frequencies and I in class 20-40
and Go-so are missing. Find the missing freg.
Class:
Frequency:
0-20
17
20-40
f
40-60 60-80 80-100
32 2 19
Total
120

Answer 1

Step-by-step explanation:

CI. medium term. Frequency. fm

0_20. 10. 17. 170

20_40. 30. f 30f

40_60. 50. 32. 1600

60_80. 70. 2. 140

80_100. 90. 19. 1710

_. _

70. +f 3620+30f

mean=total of fm/total of frequency

50=3620+30f/

70+f

3620+30f=50(70+f)

3620+30f=3500+50f

3620-3500=50f-30f

120=20f

120/20=f

6=f

hope it helps you ...