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£ represents 29 students in class
B represents students who have a brother
S represents students who have a sister
a) One student from the class is chosen at random. What is the probability that the student has a sister?
b)One of the students who has a brother is chosen at random. What is the probability that this student has a sister?​

represents 29 students in classB represents students who have a brotherS represents students who have a sistera One student from the class is chosen at random class=

Respuesta :

Answer:

Step-by-step explanation:

a)

7+4+2x+x+3=29

14+3x=29

3x=15

x=5

29-8=21

10/21

(this got me 2 marks out of 4)

sorry i couldnt be of more help xx

Answer:

b=4/11

Step-by-step explanation:

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