Answer: 1.3%
Explanation:
Given: The number of calculators T= 890
The number of defective calculators D= 12
Now, the probability that a calculator chosen at random will be defective is given by :-
P(defective )

⇒P(defective )

In percent, P(defective )

Hence, the probability that a calculator chosen at random will be defective = 1.3%