Statistics And Probability Question 79
Question: The average weight of students in a class of 35 students is 40 kg. If the weight of the teacher be included, the average rises by $ \frac{1}{2} $ kg; the weight of the teacher is
[Kerala (Engg.) 2002]
Options:
A) 40.5 kg
B) 50 kg
C) 41 kg
D) 58 kg
Show Answer
Answer:
Correct Answer: D
Solution:
Let the weight of the teacher is w kg , then $ 40+\frac{1}{2}=\frac{35\times 40+w}{35+1} $
Þ $ 36\times 40+36\times \frac{1}{2}=35\times 40+w $
Þ $ w=58 $ \ Weight of the teacher = 58kg.
BETA
