Homework#3 The ages of the 112 people who have a car injured are classified as follows: Class 0-9 10 19 20 - 29 30 39 40-49 50 - 59 60 69 70-79 80 89 Frequency 20 21 23 16 11 10 7 1 Find: 1- The mean 2- The median 3- The mode 4- Show the histogram graph.

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.