Question 1147171: 1) A bus is running at the rate of 10km/hr. during the first 60km at 20Km/hr. during second 60km, 30km/hr during the third 60km, 40km/hr. during the 4th 60km and 50km/hr. during the last 5th 60km. what would be the average speed?
2) The average IQ of 10 students in probability and statistics course is 114. If the 9 of the students have IQs of 101, 125, 118, 128, 106, 115, 99, 118 & 109, what must the IQ of 10th student.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! Bus needs 6 hours for first 60 km
3 hours for the second 60 km
2 hours for the third 60 km
1.5 hours for the fourth 60 km
1.2 hours for the last 60 km
This is 13.7 hours for 300 km or an average speed of 21.90 km/hr
average is total/N
total is 114*10=1140
The sum of the 9 is 1019
1140-1019=121 is the IQ of the tenth.
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