the following is the frequency distribution of 100 calls made in a mobile phone calculate the average duration (in second) of a call and also find the median from the cumulative frequency curve distribution (in second) 95-125 125-155 155-185 185-215 215-245 numbers of calls 14 22 28 21 15
Answers
Pls mark as a brainlist
I think it average should be 170.3 sec and Median = 170sec
See the solution in picture
Mean call time = 170.3 minutes & median = 170
Step-by-step explanation:
class mean f cf Mean*f
95 - 125 110 14 14 1540
125 - 155 140 22 36 3080
155 - 185 170 28 64 4760
185 - 215 200 21 85 4200
215 - 245 230 15 100 3450
Total 100 17030
Mean call time = 17030/100 = 170.3 minutes
Median lies in 155 - 185
Median = 155 + 30 * ( 50 - 36)/28
155 + 15
= 170
Median = 170 minutes
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