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Answer: Our required probability is 0.88.
Step-by-step explanation:
Since we have given that
Number of male students are smokers = 10
Number of male students are non smokers = 490
total number of male students = 500
Number of female students are smokers = 40
Number of female students are non smokers = 363
Total number of female students = 403
Probability that both are non smokers is given by
Hence, our required probability is 0.88.