(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 monthly number of births(thousands), in the United States during a recent year, are summarized in the table below. Calculate the relative frequency of births for each month and comment on the plausibility of the uniform probability model.

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Jan. Feb. March April May June 319 299 336 309 334 336 July Aug. Sept. Oct. Nov. Dec. Total 348 363 351 347 331 335 4008