Question

In a recent survey, it was found that the median income of families in country A was $57,700. What is the probability that a randomly selected family has an income greater than $57,700? What is the probability that a randomly selected family has an income greater than $57,700? (Type an integer or a decimal.)

Answer 1

solution:

if the question was any other dollar amount, you could not solve this without knowing the standard deviation, or some other aspect of the bell curve.

The definition of the median is that 50% of the data points will be lower than it, and 50% will be higher than it.

But since the question is "income less than median", the answer is 50%, since $57,700 is the middle points. so the required probability is 0.50