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A university has 20,000 students. The student have ages with the following probabilities: 40% are age 18, 30% are age 19, 20% are age 20, and 10% are age 21. If a student is chosen at random, what is the student's expected age?

Respuesta :

nolatoussant

Answer:

Expected age would be 18.

Step-by-step explanation:

20,000 × 40% = 8,000 18 year olds

20,000 × 30% = 6,000 19 year olds

20,000 × 20% = 4,000 20 year olds

20,000 × 10% = 2,000 21 year olds.

The probability of an 18 year old being chosen is 2/5.

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