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[...] Statistics, percentages and probabilities Ex 3 Exercise 1. The number of people affected by the disease after 15 days is 15250. 2. 10% of the population represents 13000 people. We need to determine t such that >13000 For t belonging to so the polynomial admits two roots: The coefficient in x² is negative, we therefore have: t 40 -30t²+1200t-9000 The solutions of the inequality therefore belong to the interval 30]. The nurseries were therefore closed for 20 days, from 11ème au 30ème day included people affected are so during the 10thème day. [...]
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