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In a class two third students are boys and remaining are girls. The probability of getting first class by a boy is 0.30 and the probability of getting first class by a girl is 0.24. The probability of getting first class by a randomly selected student is:

The probabilities of a student getting first class or second class or third class in an examination are (2)/(7) , (3)/(5) ,(1)/(10) respectively . The probability that the students fails is .

In a class there are 14 boys and 10 girls. If one child is absent, the probability that it is a boy is

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In a frequency distribution with classes 0-10, 10-20 etc., the size of the class intervals is 10. The lower limit of fourth class is

For overlaping classes 0-10,10-20,20-30, etc.Then the class mark of the class 0-10 is