(a) Consider the simplistic model that human births are evenly distributed over the 12 calendar months. If a person is randomly selected, say, from a phone directory, what is the probability that his or her birthday would be in November or December?
(b) The following record shows a classification of births (thousands) for 2011 in the United States. Calculate the relative frequency of births for each month and comment on the plausibility of the uniform probability model.

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321 July 346 Aug. 360 March 3 Sept 346 April314 Oct.329 299 May June 327 338 Nov. Dec. Total 322 328 3961