Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine if the events are unusual. If convenient, use the appropriate probability table or technology to find the probabilities.

Fifty$-$four percent of parents would give up cable television to have their child's education paid for You randomly select seven parents. Find the probability that the number of parents who would give up cable television to have their child's education paid for is $($a$)$ exactly three, $($b$)$ less than four, and $($c$)$ at least three