venom84661 venom84661 27-02-2024 Mathematics contestada Calculate the standard deviation of the following distribution: Age 20-25 25-30 30-35 35-40 40-45 45-50 (No. of persons) 170 110 80 45 40 35. A. 8.5 B. 9.5 C. 10.5 D. 11.5