Here’s how the computation was done:
The probability that the person voted for “Newsday” and is also age 40 or older is given by:
P(Newsday and Age 40 and above) = n(Newsday and Age 40 and above) / N
where n(Newsday and Age 40 and above) is the number of people who voted for Newsday and are age 40 or older, and N is the total number of people surveyed.
From the table given in your question, we can see that n(Newsday and Age 40 and above) = 230.
And N = 1000.
Therefore,
P(Newsday and Age 40 and above) = n(Newsday and Age 40 and above) / N = 230 / 1000 = 0.23.

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