Variance and standard deviation of the random variable


Question: Approximately 80% of workers are sure that they will be able to retire at 65 years of age. Suppose 10 workers are randomly selected.

(a) What is the probability that none of the workers will be able to retire at 65?

(b) What is the probability that 2 workers will retire at 65?

(c) Find the expected value, variance and standard deviation of the random variable X defined as ‘retirement at 65'.

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Basic Statistics: Variance and standard deviation of the random variable
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