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Mathematics, 03.07.2019 16:30 cxttiemsp021

Asmall train at an amusement park is carrying passengers. half of the passengers are 6 years old, 1/10 are 7 years old, 1/5 are 8 years old, 1/5 are 9 years old. what is the expected age for 1 of the passengers on the train?

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