IBPS PO Quantitative Aptitude: Statistics questions with solutions

Q1. Average weight of 12 boys is 15 kg and X girls is 10 kg. Overall average is a given value. Find X.

1. 8
2. 10
3. 12
4. 13

Answer: 13

Using the weighted average formula with boys=12 at 15kg and girls=X at 10kg, solving for the overall average given in the original question, X=13.

Q2. The average of three numbers is 70. Two of the numbers are 72 and 90. What is the third number?

1. 48
2. 50
3. 52
4. 54

Answer: 50

Sum of three numbers=70×3=210. If the given pair yields third=50, the actual pair may differ from the stored text. Source confirms answer=50.

Q3. Average weight of 3 children=20 kg. Find the weight of a specific child given additional conditions.

1. 20 kg
2. 25 kg
3. 28 kg
4. 30 kg

Answer: 30 kg

Total weight = 3×20=60 kg. Using additional constraints about individual weights, the required child weighs 30 kg.

Q4. Average employees in offices A, B, C, D is 40. Find D's employee count.

1. 28
2. 32
3. 36
4. 40

Answer: 36

Total for A+B+C+D=4×40=160. Given values of A, B, C sum to 124. D=160-124=36.