A) 18 minutes
B) 20 minutes
C) 17 minutes
D) 19.25 minutes
Correct Answer: D
Solution :
Replacing 25 by 18, New mean time\[=\frac{18+20+21+18}{4}=\frac{77}{4}\] \[=19.25\]minutesYou need to login to perform this action.
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