5.7 The incomes of all families in a particular suburb can be represented by a continuous random variable. It is known that the median income for all families in this suburb is $60,000 and that 40%

of all families in the suburb have incomes above

$72,000.

a. For a randomly chosen family, what is the probability that its income will be between $60,000 and

$72,000?

b. Given no further information, what can be said about the probability that a randomly chosen family has an income below $65,000?