There are 40 students in Class X of a school of whom 25 are girls and 15 are boys. The class teacher has to select one student as a class representative. She writes the name of each student on a separate cards, the cards being identical. Then she puts cards in a box and stirs them thoroughly. She then draws one card from the box. What is the probability that the name written on the card is the name of (i) a girl? (ii) a boy?
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(i) The probability for a girl is
= Total no. of girls / total students
= 25/40
= 0.625
(ii) The probability for a boy's name is
= Total no. of boys / total students
= 15/40
= 0.375
OR we can also find the probability for a boy's name by subtracting probability of a girl's name from 1..
i.e., 1 - 0.625 = 0.375
Hope it will help..
= Total no. of girls / total students
= 25/40
= 0.625
(ii) The probability for a boy's name is
= Total no. of boys / total students
= 15/40
= 0.375
OR we can also find the probability for a boy's name by subtracting probability of a girl's name from 1..
i.e., 1 - 0.625 = 0.375
Hope it will help..
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