The marks obtained by students in an examination in Mathematics, Physics and Chemistry are
normally distributed with means 65, 75 and 80 with standard deviations 11, 7 and 5
respectively. If a student is selected at random then what is the probability that he/she has
secured a total (i) of 250 or more (ii) of 200 or less (iii)between 250 and 280.
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