(Sample Material) IBPS Clerk Study Kit "Numerical Ability - Average"
Sample Materials of IBPS Clerk Study Kit
Subject: Numerical Ability
Topic: Average
Q.1 A salesman gets a bonus according to the following structure: If he sells articles worth Rs. x then he gets bonus of Rs. (x/100 – 1). In the month of January, his sales value was Rs. 100, in February it was Rs. 200, from March to November it was Rs. 300 for every month and in December it was Rs. 1200. Apart from this, he also receives a basic salary of Rs. 30 per month from his employer. Find his average income per month during the year.
(1) Rs. 35.78
(2) Rs. 30.26
(3) Rs. 32.58
(4) Rs. 38.88
(5) None of these
Q.2 The weight of a body as calculated by the average of 7 different experiments is 53.735 g. The average of the first three experiments is 54.005 g, of the fourth is 0.004 g greater than the fifth, while the average of the sixth and seventh experiment was 0.010 g less than the average of the first three. Find the weight of the body obtained by the fourth experiment.
(1) 49.353 g
(2) 51.718 g
(3) 53.342 g
(4) 54.512 g
(5) None of these
Q.3 Find the average weight of four containers, if it is known that the weight of the first container is 100 kg and the total of the second, third and fourth containers’ weight is defined by f(x) = x2 – 3/4 (x2), where x = 100.
(1) 650 kg
(2) 880 kg
(3) 760 kg
(4) 460 kg
(5) None of these
Q.4 There are five boxes in a cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher than the weight of the third box, whose weight is 25% higher than the first box’s weight. The fourth box at 350 kg is 30% lighter than the fifth box. Find the difference in the average weight of the four heaviest boxes and the four lightest boxes.
(1) 80 kg
(2) 75 kg
(3) 37.5 kg
(4) 116.8 kg
(5) None of these
Q.5 In a class of 52 students the number of boys is two less than the number of girls. Average weight of the boys is 42 kg, while the average weight of all the 52 students is 40 kg. What is the approx. average weight of the girls?
(1) 38 kg
(2) 39 kg
(3) 40 kg
(4) 42 kg
(5) None of these
