A man divided $9,000 among his wife, son, and daughter. The wife received twice as much as the daughter, and the son received $1
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Answer:
Of the 500 parents surveyed 275 would be expected to spank their children.
Step-by-step explanation:
Let the random variable <em>X </em>represent the number of parents who spank their children.
It is provided that, from previous studies, <em>p</em> = 55% of parents spank their children.
A random sample of <em>n</em> = 500 adults were selected.
The event whether a parent spank their children is independent of other parents.
The random variable <em>X </em>thus follows a Binomial distribution with parameters <em>n</em> = 500 and <em>p</em> = 0.55.
The expected value of a Binomial random variable is:
Thus, of the 500 parents surveyed 275 would be expected to spank their children.