A hi-tech compant recruits employee by two separated tests with the same quaified level of 60. An applicant may choose either A or B test to participate . According to the historical data, the scores of the two tests are normally distributed. The average and standard deviation of the scores for A test are 70 and 5; for B test, they are 68 and 8. If the degree of difficulty of A and B tests are the same to you, which test would you choose to participate to take advantage of experience of the historical data? 真的麻烦各位高手了，感激不尽... --

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