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A study on the distribution of the numbers of people infected with covid-19 in France by age group as of January 20, 2022 revealed the following table:
Xi | Fi+ |
| [0 ; 15[ | 50 |
| [15 ; 45[ | ........ |
| [45 ; 65[ | 300 |
| [65 ; 75[ | 400 |
| [75 ; 85[ | 450 |
| [85 ; 100[ | 500 |
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**** the result rounded to two decimal places ****
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