95% eeeech….

A question on the French public radio, France Inter, in a weekly high school students quizz:

If a lamp bulb factory has a constant failure rate of 5%, how many bulbs should it at least produce to deliver 1900 operational bulbs?

To which the pair taking part in the quizz, in their final year of high school and hence entering university next year (!), could not answer… Another illustration of the cataclysmic collapse of maths skills in French schools.