Symbiosis National Aptitude Test SNAP 2019 Paper

Let total number of circuit board manufactured by Robot A, B and C = 100
∴ Number of circuit board manufactured by A = 25
Number of circuit board manufactured by B = 35
Number of circuit board manufactured by C = 40
Number of faulty circuit board manufactured by A = 25 ×

5

100

= 1.25
Number of faulty circuit board manufactured by B = 35 ×

4

100

= 1.40
Number of faulty circuit board manufactured by C = 40 ×

2

100

= 0.8
Total faulty circuit board
= 1.25 + 1.4 + 0.8 = 3.45
Probability for selecting a faulty circuit board
=

3.45

100

= 0.0345