Question

there are 40 students in a class. Among them 15 are boys and the remaining are girls. If 15 of them study opt. maths find the probablity of selecting a girl studying opt. maths​

Answer 1

Answer:

TOTAL=40

BOYS=15

GIRLS=40-15=25

ANS=25÷40

FINAL ANS= 5÷8

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Answer 2

Total number of students $=40$

Number of boys $=15$

Number of girls $=25$

Probability of selecting a girl studying opt. maths​ by using Baye's Theorem of conditional probability (it is based on the occurrence of another event)=

$\frac{\frac{25}{40}\times \frac{15}{25} }{(\frac{25}{40} \times\frac{15}{25}) +(\frac{15}{40} \frac{15}{15} )} \\\\=\frac{\frac{15}{40} }{2\times\frac{15}{40} }\\ \\=\frac{1}{2}$

Hence the required probability is 1/2.

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