Answer:
Efx=2300 may be it would help : )
Step-by-step explanation:
To find that u have to :
mass mid value(x) Number..(f) fx
10-29 19 32 608
30-39 9 38 342
40-49 9 64 576
50-59 9 35 315
60-69 9 22 198
70-99 29 9 . 261
Efx=2300
