4.) What is the estimate of the mean time (in minutes) taken to complete the journey?
Select one:
O a. 105
b. 94
O c. 101
O d. 112
Answers
Answer:
i think so 105
Given : Time taken by 80 Drivers
To Find : estimate of the mean time (in minutes) taken to complete the journey
a. 105
b. 94
c. 101
d. 112
Solution:
Time interval f (number) Mean Time d =(mean -105)/10 f.d
70 - 80 4 75 -3 -12
80 - 90 10 85 -2 -20
90 - 100 14 95 -1 -14
100 - 110 20 105 0 0
110 - 120 24 115 1 24
120 - 130 8 125 2 16
80 -6
Mean = 105 + 10 x (-6)/80
= 105 -0.75
= 104.25
From given options 105 is closest option
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